139443408 has 60 divisors (see below), whose sum is σ = 420272580. Its totient is φ = 42905088.

The previous prime is 139443383. The next prime is 139443431. The reversal of 139443408 is 804344931.

139443408 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 2 ways, for example, as 54287424 + 85155984 = 7368^2 + 9228^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35373 + ... + 39116.

It is an arithmetic number, because the mean of its divisors is an integer number (7004543).

Almost surely, 2^139443408 is an apocalyptic number.

139443408 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

139443408 is an abundant number, since it is smaller than the sum of its proper divisors (280829172).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

139443408 is a wasteful number, since it uses less digits than its factorization.

139443408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74516 (or 74507 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The square root of 139443408 is about 11808.6158375993. The cubic root of 139443408 is about 518.5603770481.

The spelling of 139443408 in words is "one hundred thirty-nine million, four hundred forty-three thousand, four hundred eight".