977891 has 16 divisors (see below), whose sum is σ = 1124928. Its totient is φ = 844800.

The previous prime is 977881. The next prime is 977897. The reversal of 977891 is 198779.

It is a cyclic number.

It is not a de Polignac number, because 977891 - 2¹⁴ = 961507 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (977897) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16001 + ... + 16061.

It is an arithmetic number, because the mean of its divisors is an integer number (70308).

2⁹⁷⁷⁸⁹¹ is an apocalyptic number.

977891 is a deficient number, since it is larger than the sum of its proper divisors (147037).

977891 is a wasteful number, since it uses less digits than its factorization.

977891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142.

The product of its digits is 31752, while the sum is 41.

The square root of 977891 is about 988.8837140938. The cubic root of 977891 is about 99.2575344250.

The spelling of 977891 in words is "nine hundred seventy-seven thousand, eight hundred ninety-one".