139423242 has 64 divisors (see below), whose sum is σ = 332916480. Its totient is φ = 38083584.

The previous prime is 139423237. The next prime is 139423261. The reversal of 139423242 is 242324931.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 137128 + ... + 138140.

It is an arithmetic number, because the mean of its divisors is an integer number (5201820).

Almost surely, 2^139423242 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 139423242, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (166458240).

139423242 is an abundant number, since it is smaller than the sum of its proper divisors (193493238).

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

139423242 is a wasteful number, since it uses less digits than its factorization.

139423242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1167.

The product of its digits is 10368, while the sum is 30.

The square root of 139423242 is about 11807.7619386571. The cubic root of 139423242 is about 518.5353781546.

The spelling of 139423242 in words is "one hundred thirty-nine million, four hundred twenty-three thousand, two hundred forty-two".