139215642 has 16 divisors (see below), whose sum is σ = 290537280. Its totient is φ = 44387552.

The previous prime is 139215613. The next prime is 139215647. The reversal of 139215642 is 246512931.

It is not an unprimeable number, because it can be changed into a prime (139215647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 504267 + ... + 504542.

It is an arithmetic number, because the mean of its divisors is an integer number (18158580).

Almost surely, 2^139215642 is an apocalyptic number.

139215642 is an abundant number, since it is smaller than the sum of its proper divisors (151321638).

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

139215642 is a wasteful number, since it uses less digits than its factorization.

139215642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1008837.

The product of its digits is 12960, while the sum is 33.

The square root of 139215642 is about 11798.9678362135. The cubic root of 139215642 is about 518.2778854149.

The spelling of 139215642 in words is "one hundred thirty-nine million, two hundred fifteen thousand, six hundred forty-two".