139638390 has 32 divisors (see below), whose sum is σ = 336117600. Its totient is φ = 37127424.

The previous prime is 139638371. The next prime is 139638403. The reversal of 139638390 is 93836931.

139638390 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3802 + ... + 17138.

It is an arithmetic number, because the mean of its divisors is an integer number (10503675).

Almost surely, 2^139638390 is an apocalyptic number.

139638390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

139638390 is an abundant number, since it is smaller than the sum of its proper divisors (196479210).

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

139638390 is a wasteful number, since it uses less digits than its factorization.

139638390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13696.

The product of its (nonzero) digits is 104976, while the sum is 42.

The square root of 139638390 is about 11816.8688746216. The cubic root of 139638390 is about 518.8019633435.

The spelling of 139638390 in words is "one hundred thirty-nine million, six hundred thirty-eight thousand, three hundred ninety".