139223724 has 12 divisors (see below), whose sum is σ = 324855384. Its totient is φ = 46407904.

The previous prime is 139223713. The next prime is 139223771. The reversal of 139223724 is 427322931.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5800977 + ... + 5801000.

It is an arithmetic number, because the mean of its divisors is an integer number (27071282).

Almost surely, 2^139223724 is an apocalyptic number.

It is an amenable number.

139223724 is an abundant number, since it is smaller than the sum of its proper divisors (185631660).

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

139223724 is a wasteful number, since it uses less digits than its factorization.

139223724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11601984 (or 11601982 counting only the distinct ones).

The product of its digits is 18144, while the sum is 33.

The square root of 139223724 is about 11799.3103188280. The cubic root of 139223724 is about 518.2879145581.

The spelling of 139223724 in words is "one hundred thirty-nine million, two hundred twenty-three thousand, seven hundred twenty-four".