139712393 has 4 divisors (see below), whose sum is σ = 141068928. Its totient is φ = 138355860.

The previous prime is 139712317. The next prime is 139712411. The reversal of 139712393 is 393217931.

139712393 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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.

It is a cyclic number.

It is not a de Polignac number, because 139712393 - 2¹² = 139708297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139702393) 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, 678113 + ... + 678318.

It is an arithmetic number, because the mean of its divisors is an integer number (35267232).

Almost surely, 2^139712393 is an apocalyptic number.

It is an amenable number.

139712393 is a deficient number, since it is larger than the sum of its proper divisors (1356535).

139712393 is a wasteful number, since it uses less digits than its factorization.

139712393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1356534.

The product of its digits is 30618, while the sum is 38.

The square root of 139712393 is about 11819.9997038917. Note that the first 3 decimals coincide. The cubic root of 139712393 is about 518.8935955502.

The spelling of 139712393 in words is "one hundred thirty-nine million, seven hundred twelve thousand, three hundred ninety-three".