30886813 has 4 divisors (see below), whose sum is σ = 31033408. Its totient is φ = 30740220.

The previous prime is 30886789. The next prime is 30886829. The reversal of 30886813 is 31868803.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30886813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30886853) 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, 72981 + ... + 73402.

It is an arithmetic number, because the mean of its divisors is an integer number (7758352).

Almost surely, 2^30886813 is an apocalyptic number.

It is an amenable number.

30886813 is a deficient number, since it is larger than the sum of its proper divisors (146595).

30886813 is a wasteful number, since it uses less digits than its factorization.

30886813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146594.

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 30886813 is about 5557.5905750604. The cubic root of 30886813 is about 313.7552726848.

The spelling of 30886813 in words is "thirty million, eight hundred eighty-six thousand, eight hundred thirteen".