139567397 has 4 divisors (see below), whose sum is σ = 141135660. Its totient is φ = 137999136.

The previous prime is 139567387. The next prime is 139567409. The reversal of 139567397 is 793765931.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 22905796 + 116661601 = 4786^2 + 10801^2 .

It is a cyclic number.

It is not a de Polignac number, because 139567397 - 2¹⁰ = 139566373 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 (139567387) 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, 783998 + ... + 784175.

It is an arithmetic number, because the mean of its divisors is an integer number (35283915).

Almost surely, 2^139567397 is an apocalyptic number.

It is an amenable number.

139567397 is a deficient number, since it is larger than the sum of its proper divisors (1568263).

139567397 is an equidigital number, since it uses as much as digits as its factorization.

139567397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1568262.

The product of its digits is 1071630, while the sum is 50.

The square root of 139567397 is about 11813.8646090092. The cubic root of 139567397 is about 518.7140277567.

The spelling of 139567397 in words is "one hundred thirty-nine million, five hundred sixty-seven thousand, three hundred ninety-seven".