139725615 has 16 divisors (see below), whose sum is σ = 225196128. Its totient is φ = 73975296.

The previous prime is 139725613. The next prime is 139725617. The reversal of 139725615 is 516527931.

It is an interprime number because it is at equal distance from previous prime (139725613) and next prime (139725617).

It is not a de Polignac number, because 139725615 - 2¹ = 139725613 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139725611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31942 + ... + 36051.

It is an arithmetic number, because the mean of its divisors is an integer number (14074758).

Almost surely, 2^139725615 is an apocalyptic number.

139725615 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

139725615 is a deficient number, since it is larger than the sum of its proper divisors (85470513).

139725615 is a wasteful number, since it uses less digits than its factorization.

139725615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68138.

The product of its digits is 56700, while the sum is 39.

The square root of 139725615 is about 11820.5589969341. The cubic root of 139725615 is about 518.9099639256.

The spelling of 139725615 in words is "one hundred thirty-nine million, seven hundred twenty-five thousand, six hundred fifteen".