139244408 has 8 divisors (see below), whose sum is σ = 261083280. Its totient is φ = 69622200.

The previous prime is 139244401. The next prime is 139244411. The reversal of 139244408 is 804442931.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139244401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8702768 + ... + 8702783.

It is an arithmetic number, because the mean of its divisors is an integer number (32635410).

Almost surely, 2^139244408 is an apocalyptic number.

It is an amenable number.

139244408 is a deficient number, since it is larger than the sum of its proper divisors (121838872).

139244408 is a wasteful number, since it uses less digits than its factorization.

139244408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17405557 (or 17405553 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 35.

The square root of 139244408 is about 11800.1867781828. The cubic root of 139244408 is about 518.3135800507.

The spelling of 139244408 in words is "one hundred thirty-nine million, two hundred forty-four thousand, four hundred eight".