30890923 has 16 divisors (see below), whose sum is σ = 36388800. Its totient is φ = 26210688.

The previous prime is 30890869. The next prime is 30890929. The reversal of 30890923 is 32909803.

It is a de Polignac number, because none of the positive numbers 2^k-30890923 is a prime.

It is not an unprimeable number, because it can be changed into a prime (30890929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38361 + ... + 39157.

It is an arithmetic number, because the mean of its divisors is an integer number (2274300).

Almost surely, 2^30890923 is an apocalyptic number.

30890923 is a deficient number, since it is larger than the sum of its proper divisors (5497877).

30890923 is an equidigital number, since it uses as much as digits as its factorization.

30890923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 931 (or 917 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 30890923 is about 5557.9603273143. The cubic root of 30890923 is about 313.7691888393.

It can be divided in two parts, 30890 and 923, that added together give a palindrome (31813).

The spelling of 30890923 in words is "thirty million, eight hundred ninety thousand, nine hundred twenty-three".