139868515 has 4 divisors (see below), whose sum is σ = 167842224. Its totient is φ = 111894808.

The previous prime is 139868501. The next prime is 139868539. The reversal of 139868515 is 515868931.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 139868515 - 2⁵ = 139868483 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13986847 + ... + 13986856.

It is an arithmetic number, because the mean of its divisors is an integer number (41960556).

Almost surely, 2^139868515 is an apocalyptic number.

139868515 is a deficient number, since it is larger than the sum of its proper divisors (27973709).

139868515 is an equidigital number, since it uses as much as digits as its factorization.

139868515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27973708.

The product of its digits is 259200, while the sum is 46.

The square root of 139868515 is about 11826.6020056481. The cubic root of 139868515 is about 519.0868032958.

The spelling of 139868515 in words is "one hundred thirty-nine million, eight hundred sixty-eight thousand, five hundred fifteen".