30886139 has 4 divisors (see below), whose sum is σ = 31083024. Its totient is φ = 30689256.

The previous prime is 30886133. The next prime is 30886147. The reversal of 30886139 is 93168803.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30886139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30886133) 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, 98207 + ... + 98520.

It is an arithmetic number, because the mean of its divisors is an integer number (7770756).

Almost surely, 2^30886139 is an apocalyptic number.

30886139 is a deficient number, since it is larger than the sum of its proper divisors (196885).

30886139 is a wasteful number, since it uses less digits than its factorization.

30886139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196884.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 30886139 is about 5557.5299369414. The cubic root of 30886139 is about 313.7529904531.

The spelling of 30886139 in words is "thirty million, eight hundred eighty-six thousand, one hundred thirty-nine".