139621215 has 32 divisors (see below), whose sum is σ = 240641280. Its totient is φ = 68898816.

The previous prime is 139621213. The next prime is 139621219. The reversal of 139621215 is 512126931.

It is not a de Polignac number, because 139621215 - 2¹ = 139621213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139621213) 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, 6559 + ... + 17951.

It is an arithmetic number, because the mean of its divisors is an integer number (7520040).

Almost surely, 2^139621215 is an apocalyptic number.

139621215 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

139621215 is a deficient number, since it is larger than the sum of its proper divisors (101020065).

139621215 is a wasteful number, since it uses less digits than its factorization.

139621215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11463.

The product of its digits is 3240, while the sum is 30.

The square root of 139621215 is about 11816.1421369244. The cubic root of 139621215 is about 518.7806922374.

The spelling of 139621215 in words is "one hundred thirty-nine million, six hundred twenty-one thousand, two hundred fifteen".