977890 has 8 divisors (see below), whose sum is σ = 1760220. Its totient is φ = 391152.

The previous prime is 977881. The next prime is 977897. The reversal of 977890 is 98779.

It can be written as a sum of positive squares in 2 ways, for example, as 974169 + 3721 = 987^2 + 61^2 .

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

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

977890 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48885 + ... + 48904.

2⁹⁷⁷⁸⁹⁰ is an apocalyptic number.

977890 is a deficient number, since it is larger than the sum of its proper divisors (782330).

977890 is a wasteful number, since it uses less digits than its factorization.

977890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97796.

The product of its (nonzero) digits is 31752, while the sum is 40.

The square root of 977890 is about 988.8832084731. The cubic root of 977890 is about 99.2575005911.

The spelling of 977890 in words is "nine hundred seventy-seven thousand, eight hundred ninety".