977816 has 32 divisors (see below), whose sum is σ = 2208000. Its totient is φ = 396576.

The previous prime is 977813. The next prime is 977819. The reversal of 977816 is 618779.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (977813) and next prime (977819).

It is a super-2 number, since 2×977816² = 1912248259712, which contains 22 as substring.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a nialpdrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 977816.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 977816.

It is not an unprimeable number, because it can be changed into a prime (977813) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 605 + ... + 1523.

It is an arithmetic number, because the mean of its divisors is an integer number (69000).

2⁹⁷⁷⁸¹⁶ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 977816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1104000).

977816 is an abundant number, since it is smaller than the sum of its proper divisors (1230184).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

977816 is a wasteful number, since it uses less digits than its factorization.

977816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 951 (or 947 counting only the distinct ones).

The product of its digits is 21168, while the sum is 38.

The square root of 977816 is about 988.8457918199. The cubic root of 977816 is about 99.2549968192.

The spelling of 977816 in words is "nine hundred seventy-seven thousand, eight hundred sixteen".