30542139 has 12 divisors (see below), whose sum is σ = 46438600. Its totient is φ = 19289664.

The previous prime is 30542123. The next prime is 30542147. The reversal of 30542139 is 93124503.

It is not a de Polignac number, because 30542139 - 2⁴ = 30542123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30542119) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 89134 + ... + 89475.

Almost surely, 2^30542139 is an apocalyptic number.

30542139 is a deficient number, since it is larger than the sum of its proper divisors (15896461).

30542139 is a wasteful number, since it uses less digits than its factorization.

30542139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178634 (or 178631 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 30542139 is about 5526.4942775687. The cubic root of 30542139 is about 312.5838119731.

The spelling of 30542139 in words is "thirty million, five hundred forty-two thousand, one hundred thirty-nine".