977857 has 8 divisors (see below), whose sum is σ = 1047816. Its totient is φ = 909312.

The previous prime is 977849. The next prime is 977861. The reversal of 977857 is 758779.

It can be written as a sum of positive squares in 4 ways, for example, as 287296 + 690561 = 536^2 + 831^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 977857 - 2³ = 977849 is a prime.

It is an Ulam number.

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 7 ways as a sum of consecutive naturals, for example, 1353 + ... + 1945.

It is an arithmetic number, because the mean of its divisors is an integer number (130977).

2⁹⁷⁷⁸⁵⁷ is an apocalyptic number.

977857 is a gapful number since it is divisible by the number (97) formed by its first and last digit.

It is an amenable number.

977857 is a deficient number, since it is larger than the sum of its proper divisors (69959).

977857 is a wasteful number, since it uses less digits than its factorization.

977857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 707.

The product of its digits is 123480, while the sum is 43.

The square root of 977857 is about 988.8665228432. The cubic root of 977857 is about 99.2563840598.

It can be divided in two parts, 97 and 7857, that multiplied together give a square (762129 = 873²).

The spelling of 977857 in words is "nine hundred seventy-seven thousand, eight hundred fifty-seven".