139659893 has 4 divisors (see below), whose sum is σ = 139872480. Its totient is φ = 139447308.

The previous prime is 139659881. The next prime is 139659907. The reversal of 139659893 is 398956931.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 139659893 - 2²⁴ = 122882677 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139659803) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105305 + ... + 106622.

It is an arithmetic number, because the mean of its divisors is an integer number (34968120).

Almost surely, 2^139659893 is an apocalyptic number.

It is an amenable number.

139659893 is a deficient number, since it is larger than the sum of its proper divisors (212587).

139659893 is an equidigital number, since it uses as much as digits as its factorization.

139659893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212586.

The product of its digits is 1574640, while the sum is 53.

The square root of 139659893 is about 11817.7786829844. The cubic root of 139659893 is about 518.8285921859.

The spelling of 139659893 in words is "one hundred thirty-nine million, six hundred fifty-nine thousand, eight hundred ninety-three".