31077930 has 32 divisors (see below), whose sum is σ = 80325504. Its totient is φ = 7649856.

The previous prime is 31077929. The next prime is 31077931. The reversal of 31077930 is 3977013.

It is an interprime number because it is at equal distance from previous prime (31077929) and next prime (31077931).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (31077931) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 39454 + ... + 40233.

It is an arithmetic number, because the mean of its divisors is an integer number (2510172).

Almost surely, 2^31077930 is an apocalyptic number.

31077930 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

31077930 is an abundant number, since it is smaller than the sum of its proper divisors (49247574).

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

31077930 is a wasteful number, since it uses less digits than its factorization.

31077930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79710.

The product of its (nonzero) digits is 3969, while the sum is 30.

The square root of 31077930 is about 5574.7582907244. The cubic root of 31077930 is about 314.4010791551.

The spelling of 31077930 in words is "thirty-one million, seventy-seven thousand, nine hundred thirty".