30121923 has 16 divisors (see below), whose sum is σ = 44745120. Its totient is φ = 17896704.

The previous prime is 30121907. The next prime is 30121951. The reversal of 30121923 is 32912103.

It is a happy number.

It is not a de Polignac number, because 30121923 - 2⁴ = 30121907 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 30121923.

It is not an unprimeable number, because it can be changed into a prime (30121523) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12186 + ... + 14447.

It is an arithmetic number, because the mean of its divisors is an integer number (2796570).

Almost surely, 2^30121923 is an apocalyptic number.

30121923 is a deficient number, since it is larger than the sum of its proper divisors (14623197).

30121923 is a wasteful number, since it uses less digits than its factorization.

30121923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26678.

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 30121923 is about 5488.3442858480. The cubic root of 30121923 is about 311.1436184239.

The spelling of 30121923 in words is "thirty million, one hundred twenty-one thousand, nine hundred twenty-three".