1977816 has 32 divisors (see below), whose sum is σ = 5160960. Its totient is φ = 630432.

The previous prime is 1977809. The next prime is 1977817. The reversal of 1977816 is 6187791.

It is a super-2 number, since 2×1977816² = 7823512259712, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1977817) 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, 1240 + ... + 2343.

It is an arithmetic number, because the mean of its divisors is an integer number (161280).

2^1977816 is an apocalyptic number.

It is an amenable number.

1977816 is an abundant number, since it is smaller than the sum of its proper divisors (3183144).

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

1977816 is a wasteful number, since it uses less digits than its factorization.

1977816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3615 (or 3611 counting only the distinct ones).

The product of its digits is 21168, while the sum is 39.

The square root of 1977816 is about 1406.3484632196. The cubic root of 1977816 is about 125.5245371408.

The spelling of 1977816 in words is "one million, nine hundred seventy-seven thousand, eight hundred sixteen".