139439824 has 10 divisors (see below), whose sum is σ = 270164690. Its totient is φ = 69719904.

The previous prime is 139439789. The next prime is 139439837. The reversal of 139439824 is 428934931.

139439824 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 96668224 + 42771600 = 9832^2 + 6540^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4357479 + ... + 4357510.

It is an arithmetic number, because the mean of its divisors is an integer number (27016469).

Almost surely, 2^139439824 is an apocalyptic number.

It is an amenable number.

139439824 is a deficient number, since it is larger than the sum of its proper divisors (130724866).

139439824 is an equidigital number, since it uses as much as digits as its factorization.

139439824 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8714997 (or 8714991 counting only the distinct ones).

The product of its digits is 186624, while the sum is 43.

The square root of 139439824 is about 11808.4640830211. The cubic root of 139439824 is about 518.5559342988. Note that the first 3 decimals are identical.

The spelling of 139439824 in words is "one hundred thirty-nine million, four hundred thirty-nine thousand, eight hundred twenty-four".