1977738 has 48 divisors (see below), whose sum is σ = 4766400. Its totient is φ = 546840.

The previous prime is 1977737. The next prime is 1977743. The reversal of 1977738 is 8377791.

It is a happy number.

It is a super-2 number, since 2×1977738² = 7822895193288, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 1977738.

It is not an unprimeable number, because it can be changed into a prime (1977737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 63783 + ... + 63813.

It is an arithmetic number, because the mean of its divisors is an integer number (99300).

2^1977738 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1977738, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2383200).

1977738 is an abundant number, since it is smaller than the sum of its proper divisors (2788662).

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

1977738 is an equidigital number, since it uses as much as digits as its factorization.

1977738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88 (or 43 counting only the distinct ones).

The product of its digits is 74088, while the sum is 42.

The square root of 1977738 is about 1406.3207315545. The cubic root of 1977738 is about 125.5228869970.

Multiplying 1977738 by its sum of digits (42), we get a square (83064996 = 9114²).

1977738 divided by its sum of digits (42) gives a square (47089 = 217²).

Multiplying 1977738 by its product of digits (74088), we get a square (146526652944 = 382788²).

The spelling of 1977738 in words is "one million, nine hundred seventy-seven thousand, seven hundred thirty-eight".