30938857 has 4 divisors (see below), whose sum is σ = 31067476. Its totient is φ = 30810240.

The previous prime is 30938819. The next prime is 30938863. The reversal of 30938857 is 75883903.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 21353641 + 9585216 = 4621^2 + 3096^2 .

It is a cyclic number.

It is not a de Polignac number, because 30938857 - 2²³ = 22550249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30930857) 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 3 ways as a sum of consecutive naturals, for example, 63948 + ... + 64429.

It is an arithmetic number, because the mean of its divisors is an integer number (7766869).

Almost surely, 2^30938857 is an apocalyptic number.

It is an amenable number.

30938857 is a deficient number, since it is larger than the sum of its proper divisors (128619).

30938857 is a wasteful number, since it uses less digits than its factorization.

30938857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128618.

The product of its (nonzero) digits is 181440, while the sum is 43.

The square root of 30938857 is about 5562.2708492126. The cubic root of 30938857 is about 313.9313987286.

The spelling of 30938857 in words is "thirty million, nine hundred thirty-eight thousand, eight hundred fifty-seven".