30139015 has 4 divisors (see below), whose sum is σ = 36166824. Its totient is φ = 24111208.

The previous prime is 30139013. The next prime is 30139019. The reversal of 30139015 is 51093103.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51093103 = 283 ⋅180541.

It is a cyclic number.

It is not a de Polignac number, because 30139015 - 2¹ = 30139013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30139013) 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, 3013897 + ... + 3013906.

It is an arithmetic number, because the mean of its divisors is an integer number (9041706).

Almost surely, 2^30139015 is an apocalyptic number.

30139015 is a deficient number, since it is larger than the sum of its proper divisors (6027809).

30139015 is an equidigital number, since it uses as much as digits as its factorization.

30139015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6027808.

The product of its (nonzero) digits is 405, while the sum is 22.

The square root of 30139015 is about 5489.9011830815. The cubic root of 30139015 is about 311.2024577525.

The spelling of 30139015 in words is "thirty million, one hundred thirty-nine thousand, fifteen".