977987 has 4 divisors (see below), whose sum is σ = 1029480. Its totient is φ = 926496.

The previous prime is 977971. The next prime is 978001. The reversal of 977987 is 789779.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 789779 = 409 ⋅1931.

It is a cyclic number.

It is not a de Polignac number, because 977987 - 2⁴ = 977971 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 977987.

It is not an unprimeable number, because it can be changed into a prime (977927) 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 3 ways as a sum of consecutive naturals, for example, 25718 + ... + 25755.

It is an arithmetic number, because the mean of its divisors is an integer number (257370).

2⁹⁷⁷⁹⁸⁷ is an apocalyptic number.

977987 is a deficient number, since it is larger than the sum of its proper divisors (51493).

977987 is a wasteful number, since it uses less digits than its factorization.

977987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51492.

The product of its digits is 222264, while the sum is 47.

The square root of 977987 is about 988.9322524824. The cubic root of 977987 is about 99.2607823710.

The spelling of 977987 in words is "nine hundred seventy-seven thousand, nine hundred eighty-seven".