139315397 has 8 divisors (see below), whose sum is σ = 154087416. Its totient is φ = 125122752.

The previous prime is 139315387. The next prime is 139315411. The reversal of 139315397 is 793513931.

It can be written as a sum of positive squares in 4 ways, for example, as 8579041 + 130736356 = 2929^2 + 11434^2 .

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

It is not a de Polignac number, because 139315397 - 2⁴ = 139315381 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 (139315367) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 144338 + ... + 145299.

It is an arithmetic number, because the mean of its divisors is an integer number (19260927).

Almost surely, 2^139315397 is an apocalyptic number.

It is an amenable number.

139315397 is a deficient number, since it is larger than the sum of its proper divisors (14772019).

139315397 is a wasteful number, since it uses less digits than its factorization.

139315397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289687.

The product of its digits is 76545, while the sum is 41.

The square root of 139315397 is about 11803.1943557666. The cubic root of 139315397 is about 518.4016465715.

The spelling of 139315397 in words is "one hundred thirty-nine million, three hundred fifteen thousand, three hundred ninety-seven".