139907689 has 4 divisors (see below), whose sum is σ = 145990656. Its totient is φ = 133824724.

The previous prime is 139907623. The next prime is 139907699. The reversal of 139907689 is 986709931.

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, and also an emirpimes, since its reverse is a distinct semiprime: 986709931 = 8053 ⋅122527.

It is a cyclic number.

It is not a de Polignac number, because 139907689 - 2⁷ = 139907561 is a prime.

It is a super-2 number, since 2×139907689² = 39148322882641442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139907609) by changing a digit.

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, 3041449 + ... + 3041494.

It is an arithmetic number, because the mean of its divisors is an integer number (36497664).

Almost surely, 2^139907689 is an apocalyptic number.

It is an amenable number.

139907689 is a deficient number, since it is larger than the sum of its proper divisors (6082967).

139907689 is an equidigital number, since it uses as much as digits as its factorization.

139907689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6082966.

The product of its (nonzero) digits is 734832, while the sum is 52.

The square root of 139907689 is about 11828.2580712462. The cubic root of 139907689 is about 519.1352602538.

The spelling of 139907689 in words is "one hundred thirty-nine million, nine hundred seven thousand, six hundred eighty-nine".