476642139 has 4 divisors (see below), whose sum is σ = 635522856. Its totient is φ = 317761424.

The previous prime is 476642123. The next prime is 476642171. The reversal of 476642139 is 931246674.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 476642139 - 2⁴ = 476642123 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 476642139.

It is not an unprimeable number, because it can be changed into a prime (476642339) 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, 79440354 + ... + 79440359.

It is an arithmetic number, because the mean of its divisors is an integer number (158880714).

Almost surely, 2^476642139 is an apocalyptic number.

476642139 is a deficient number, since it is larger than the sum of its proper divisors (158880717).

476642139 is a wasteful number, since it uses less digits than its factorization.

476642139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158880716.

The product of its digits is 217728, while the sum is 42.

The square root of 476642139 is about 21832.1354658677. The cubic root of 476642139 is about 781.1434789894.

The spelling of 476642139 in words is "four hundred seventy-six million, six hundred forty-two thousand, one hundred thirty-nine".