120240639 has 24 divisors (see below), whose sum is σ = 183135120. Its totient is φ = 77969952.

The previous prime is 120240629. The next prime is 120240649. The reversal of 120240639 is 936042021.

120240639 is a `hidden beast` number, since 1 + 2 + 0 + 24 + 0 + 639 = 666.

It is an interprime number because it is at equal distance from previous prime (120240629) and next prime (120240649).

It is not a de Polignac number, because 120240639 - 2⁸ = 120240383 is a prime.

It is a super-2 number, since 2×120240639² = 28915622534256642, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120240629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 35337 + ... + 38589.

It is an arithmetic number, because the mean of its divisors is an integer number (7630630).

Almost surely, 2^120240639 is an apocalyptic number.

120240639 is a deficient number, since it is larger than the sum of its proper divisors (62894481).

120240639 is an equidigital number, since it uses as much as digits as its factorization.

120240639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3336 (or 3293 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 120240639 is about 10965.4292665632. The cubic root of 120240639 is about 493.5718985054.

The spelling of 120240639 in words is "one hundred twenty million, two hundred forty thousand, six hundred thirty-nine".