139321623 has 16 divisors (see below), whose sum is σ = 223473920. Its totient is φ = 75422016.

The previous prime is 139321619. The next prime is 139321639. The reversal of 139321623 is 326123931.

It is not a de Polignac number, because 139321623 - 2² = 139321619 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139321123) 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 in 15 ways as a sum of consecutive naturals, for example, 174190 + ... + 174987.

It is an arithmetic number, because the mean of its divisors is an integer number (13967120).

Almost surely, 2^139321623 is an apocalyptic number.

139321623 is a deficient number, since it is larger than the sum of its proper divisors (84152297).

139321623 is a wasteful number, since it uses less digits than its factorization.

139321623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 349206.

The product of its digits is 5832, while the sum is 30.

The square root of 139321623 is about 11803.4580949822. The cubic root of 139321623 is about 518.4093689067.

The spelling of 139321623 in words is "one hundred thirty-nine million, three hundred twenty-one thousand, six hundred twenty-three".