30813933 has 8 divisors (see below), whose sum is σ = 42195808. Its totient is φ = 19987344.

The previous prime is 30813901. The next prime is 30813941. The reversal of 30813933 is 33931803.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 30813933 - 2⁵ = 30813901 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 30813933.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30813533) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 138691 + ... + 138912.

It is an arithmetic number, because the mean of its divisors is an integer number (5274476).

Almost surely, 2^30813933 is an apocalyptic number.

It is an amenable number.

30813933 is a deficient number, since it is larger than the sum of its proper divisors (11381875).

30813933 is a wasteful number, since it uses less digits than its factorization.

30813933 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277643.

The product of its (nonzero) digits is 5832, while the sum is 30.

The square root of 30813933 is about 5551.0299044412. The cubic root of 30813933 is about 313.5083011266.

It can be divided in two parts, 308 and 13933, that added together give a palindrome (14241).

The spelling of 30813933 in words is "thirty million, eight hundred thirteen thousand, nine hundred thirty-three".