139707397 has 4 divisors (see below), whose sum is σ = 139915660. Its totient is φ = 139499136.

The previous prime is 139707383. The next prime is 139707401. The reversal of 139707397 is 793707931.

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 27050401 + 112656996 = 5201^2 + 10614^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139707397 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 (139707367) 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, 103122 + ... + 104467.

It is an arithmetic number, because the mean of its divisors is an integer number (34978915).

Almost surely, 2^139707397 is an apocalyptic number.

It is an amenable number.

139707397 is a deficient number, since it is larger than the sum of its proper divisors (208263).

139707397 is an equidigital number, since it uses as much as digits as its factorization.

139707397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208262.

The product of its (nonzero) digits is 250047, while the sum is 46.

The square root of 139707397 is about 11819.7883652796. The cubic root of 139707397 is about 518.8874104074.

The spelling of 139707397 in words is "one hundred thirty-nine million, seven hundred seven thousand, three hundred ninety-seven".