139223723 has 4 divisors (see below), whose sum is σ = 142461528. Its totient is φ = 135985920.

The previous prime is 139223713. The next prime is 139223771. The reversal of 139223723 is 327322931.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 139223723 - 2¹² = 139219627 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 139223723.

It is not an unprimeable number, because it can be changed into a prime (139223713) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1618838 + ... + 1618923.

It is an arithmetic number, because the mean of its divisors is an integer number (35615382).

Almost surely, 2^139223723 is an apocalyptic number.

139223723 is a deficient number, since it is larger than the sum of its proper divisors (3237805).

139223723 is an equidigital number, since it uses as much as digits as its factorization.

139223723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3237804.

The product of its digits is 13608, while the sum is 32.

The square root of 139223723 is about 11799.3102764526. The cubic root of 139223723 is about 518.2879133172.

The spelling of 139223723 in words is "one hundred thirty-nine million, two hundred twenty-three thousand, seven hundred twenty-three".