139536769 has 4 divisors (see below), whose sum is σ = 140267520. Its totient is φ = 138806020.

The previous prime is 139536767. The next prime is 139536773. The reversal of 139536769 is 967635931.

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: 967635931 = 59 ⋅16400609.

It is a cyclic number.

It is not a de Polignac number, because 139536769 - 2¹ = 139536767 is a prime.

It is a super-2 number, since 2×139536769² = 38941019805918722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139536767) 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, 365089 + ... + 365470.

It is an arithmetic number, because the mean of its divisors is an integer number (35066880).

Almost surely, 2^139536769 is an apocalyptic number.

It is an amenable number.

139536769 is a deficient number, since it is larger than the sum of its proper divisors (730751).

139536769 is an equidigital number, since it uses as much as digits as its factorization.

139536769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 730750.

The product of its digits is 918540, while the sum is 49.

The square root of 139536769 is about 11812.5682643530. The cubic root of 139536769 is about 518.6760811305.

The spelling of 139536769 in words is "one hundred thirty-nine million, five hundred thirty-six thousand, seven hundred sixty-nine".