139399390 has 32 divisors (see below), whose sum is σ = 284447520. Its totient is φ = 48760704.

The previous prime is 139399369. The next prime is 139399397. The reversal of 139399390 is 93993931.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 139399390.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139399397) 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, 25749 + ... + 30688.

It is an arithmetic number, because the mean of its divisors is an integer number (8888985).

Almost surely, 2^139399390 is an apocalyptic number.

139399390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

139399390 is an abundant number, since it is smaller than the sum of its proper divisors (145048130).

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

139399390 is a wasteful number, since it uses less digits than its factorization.

139399390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56476.

The product of its (nonzero) digits is 177147, while the sum is 46.

The square root of 139399390 is about 11806.7518818683. The cubic root of 139399390 is about 518.5058067789.

The spelling of 139399390 in words is "one hundred thirty-nine million, three hundred ninety-nine thousand, three hundred ninety".