120155639 has 4 divisors (see below), whose sum is σ = 126479640. Its totient is φ = 113831640.

The previous prime is 120155621. The next prime is 120155653. The reversal of 120155639 is 936551021.

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 120155639 - 2⁸ = 120155383 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 (120155339) 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, 3161972 + ... + 3162009.

It is an arithmetic number, because the mean of its divisors is an integer number (31619910).

Almost surely, 2^120155639 is an apocalyptic number.

120155639 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

120155639 is a deficient number, since it is larger than the sum of its proper divisors (6324001).

120155639 is an equidigital number, since it uses as much as digits as its factorization.

120155639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6324000.

The product of its (nonzero) digits is 8100, while the sum is 32.

The square root of 120155639 is about 10961.5527640932. The cubic root of 120155639 is about 493.4555665079.

The spelling of 120155639 in words is "one hundred twenty million, one hundred fifty-five thousand, six hundred thirty-nine".