139021715 has 12 divisors (see below), whose sum is σ = 190754064. Its totient is φ = 95281344.

The previous prime is 139021681. The next prime is 139021739. The reversal of 139021715 is 517120931.

It is not a de Polignac number, because 139021715 - 2¹⁴ = 139005331 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 68759 + ... + 70751.

It is an arithmetic number, because the mean of its divisors is an integer number (15896172).

Almost surely, 2^139021715 is an apocalyptic number.

139021715 is a deficient number, since it is larger than the sum of its proper divisors (51732349).

139021715 is an frugal number, since it uses more digits than its factorization.

139021715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3998 (or 2005 counting only the distinct ones).

The product of its (nonzero) digits is 1890, while the sum is 29.

The square root of 139021715 is about 11790.7470077175. The cubic root of 139021715 is about 518.0371203702.

The spelling of 139021715 in words is "one hundred thirty-nine million, twenty-one thousand, seven hundred fifteen".