139508390 has 64 divisors (see below), whose sum is σ = 296784000. Its totient is φ = 47190528.

The previous prime is 139508387. The next prime is 139508399. The reversal of 139508390 is 93805931.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139508399) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 305042 + ... + 305498.

It is an arithmetic number, because the mean of its divisors is an integer number (4637250).

Almost surely, 2^139508390 is an apocalyptic number.

139508390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

139508390 is an abundant number, since it is smaller than the sum of its proper divisors (157275610).

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

139508390 is an equidigital number, since it uses as much as digits as its factorization.

139508390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 574 (or 560 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 38.

The square root of 139508390 is about 11811.3669826993. The cubic root of 139508390 is about 518.6409159512.

The spelling of 139508390 in words is "one hundred thirty-nine million, five hundred eight thousand, three hundred ninety".