139023697 has 8 divisors (see below), whose sum is σ = 144312192. Its totient is φ = 133832400.

The previous prime is 139023691. The next prime is 139023721. The reversal of 139023697 is 796320931.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139023697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139023691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21379 + ... + 27112.

It is an arithmetic number, because the mean of its divisors is an integer number (18039024).

Almost surely, 2^139023697 is an apocalyptic number.

It is an amenable number.

139023697 is a deficient number, since it is larger than the sum of its proper divisors (5288495).

139023697 is an equidigital number, since it uses as much as digits as its factorization.

139023697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48599.

The product of its (nonzero) digits is 61236, while the sum is 40.

The square root of 139023697 is about 11790.8310563760. The cubic root of 139023697 is about 518.0395822031.

The spelling of 139023697 in words is "one hundred thirty-nine million, twenty-three thousand, six hundred ninety-seven".