139797529 has 4 divisors (see below), whose sum is σ = 139925376. Its totient is φ = 139669684.

The previous prime is 139797527. The next prime is 139797547. The reversal of 139797529 is 925797931.

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: 925797931 = 109 ⋅8493559.

It is a cyclic number.

It is not a de Polignac number, because 139797529 - 2¹ = 139797527 is a prime.

It is a super-2 number, since 2×139797529² = 39086698229011682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139797527) 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, 62269 + ... + 64474.

It is an arithmetic number, because the mean of its divisors is an integer number (34981344).

Almost surely, 2^139797529 is an apocalyptic number.

It is an amenable number.

139797529 is a deficient number, since it is larger than the sum of its proper divisors (127847).

139797529 is a wasteful number, since it uses less digits than its factorization.

139797529 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127846.

The product of its digits is 1071630, while the sum is 52.

The square root of 139797529 is about 11823.6005091512. The cubic root of 139797529 is about 518.9989728758.

The spelling of 139797529 in words is "one hundred thirty-nine million, seven hundred ninety-seven thousand, five hundred twenty-nine".