30123813 has 32 divisors (see below), whose sum is σ = 45211392. Its totient is φ = 17740800.

The previous prime is 30123787. The next prime is 30123827. The reversal of 30123813 is 31832103.

It is a happy number.

It is not a de Polignac number, because 30123813 - 2⁶ = 30123749 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 30123813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30123833) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 71343 + ... + 71763.

It is an arithmetic number, because the mean of its divisors is an integer number (1412856).

Almost surely, 2^30123813 is an apocalyptic number.

It is an amenable number.

30123813 is a deficient number, since it is larger than the sum of its proper divisors (15087579).

30123813 is a wasteful number, since it uses less digits than its factorization.

30123813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 525.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 30123813 is about 5488.5164662229. The cubic root of 30123813 is about 311.1501258564.

Adding to 30123813 its reverse (31832103), we get a palindrome (61955916).

The spelling of 30123813 in words is "thirty million, one hundred twenty-three thousand, eight hundred thirteen".