139472391 has 8 divisors (see below), whose sum is σ = 194048640. Its totient is φ = 88938872.

The previous prime is 139472387. The next prime is 139472393. The reversal of 139472391 is 193274931.

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

It is a cyclic number.

It is not a de Polignac number, because 139472391 - 2² = 139472387 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139472393) 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, 1010601 + ... + 1010738.

It is an arithmetic number, because the mean of its divisors is an integer number (24256080).

Almost surely, 2^139472391 is an apocalyptic number.

139472391 is a deficient number, since it is larger than the sum of its proper divisors (54576249).

139472391 is a wasteful number, since it uses less digits than its factorization.

139472391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2021365.

The product of its digits is 40824, while the sum is 39.

The square root of 139472391 is about 11809.8429710136. The cubic root of 139472391 is about 518.5963017635.

The spelling of 139472391 in words is "one hundred thirty-nine million, four hundred seventy-two thousand, three hundred ninety-one".