30428123 has 4 divisors (see below), whose sum is σ = 33194328. Its totient is φ = 27661920.

The previous prime is 30428119. The next prime is 30428137. The reversal of 30428123 is 32182403.

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

It is not a de Polignac number, because 30428123 - 2² = 30428119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30428323) 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, 1383086 + ... + 1383107.

It is an arithmetic number, because the mean of its divisors is an integer number (8298582).

Almost surely, 2^30428123 is an apocalyptic number.

30428123 is a deficient number, since it is larger than the sum of its proper divisors (2766205).

30428123 is a wasteful number, since it uses less digits than its factorization.

30428123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2766204.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 30428123 is about 5516.1692323568. The cubic root of 30428123 is about 312.1943610088.

The spelling of 30428123 in words is "thirty million, four hundred twenty-eight thousand, one hundred twenty-three".