30866939 has 4 divisors (see below), whose sum is σ = 31039560. Its totient is φ = 30694320.

The previous prime is 30866929. The next prime is 30866977. The reversal of 30866939 is 93966803.

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

It is a cyclic number.

It is not a de Polignac number, because 30866939 - 2²⁰ = 29818363 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 30866939.

It is not an unprimeable number, because it can be changed into a prime (30866909) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86042 + ... + 86399.

It is an arithmetic number, because the mean of its divisors is an integer number (7759890).

Almost surely, 2^30866939 is an apocalyptic number.

30866939 is a deficient number, since it is larger than the sum of its proper divisors (172621).

30866939 is a wasteful number, since it uses less digits than its factorization.

30866939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172620.

The product of its (nonzero) digits is 209952, while the sum is 44.

The square root of 30866939 is about 5555.8022822991. The cubic root of 30866939 is about 313.6879633751.

The spelling of 30866939 in words is "thirty million, eight hundred sixty-six thousand, nine hundred thirty-nine".