120156139 has 4 divisors (see below), whose sum is σ = 120297856. Its totient is φ = 120014424.

The previous prime is 120156109. The next prime is 120156143. The reversal of 120156139 is 931651021.

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

It is a cyclic number.

It is not a de Polignac number, because 120156139 - 2⁵ = 120156107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (120156109) 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, 69579 + ... + 71284.

It is an arithmetic number, because the mean of its divisors is an integer number (30074464).

Almost surely, 2^120156139 is an apocalyptic number.

120156139 is a deficient number, since it is larger than the sum of its proper divisors (141717).

120156139 is an equidigital number, since it uses as much as digits as its factorization.

120156139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141716.

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 120156139 is about 10961.5755710573. The cubic root of 120156139 is about 493.4562509742.

It can be divided in two parts, 120156 and 139, that added together give a triangular number (120295 = T₄₉₀).

The spelling of 120156139 in words is "one hundred twenty million, one hundred fifty-six thousand, one hundred thirty-nine".