139281647 has 8 divisors (see below), whose sum is σ = 148037760. Its totient is φ = 130668120.

The previous prime is 139281643. The next prime is 139281683. The reversal of 139281647 is 746182931.

139281647 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 139281647 - 2² = 139281643 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 (139281643) 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, 33629 + ... + 37542.

It is an arithmetic number, because the mean of its divisors is an integer number (18504720).

Almost surely, 2^139281647 is an apocalyptic number.

139281647 is a deficient number, since it is larger than the sum of its proper divisors (8756113).

139281647 is a wasteful number, since it uses less digits than its factorization.

139281647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71293.

The product of its digits is 72576, while the sum is 41.

The square root of 139281647 is about 11801.7645714529. The cubic root of 139281647 is about 518.3597812095.

The spelling of 139281647 in words is "one hundred thirty-nine million, two hundred eighty-one thousand, six hundred forty-seven".