642439179 has 12 divisors (see below), whose sum is σ = 928272696. Its totient is φ = 428152032.

The previous prime is 642439159. The next prime is 642439181. The reversal of 642439179 is 971934246.

It is a happy number.

642439179 is a `hidden beast` number, since 6 + 42 + 439 + 179 = 666.

It is not a de Polignac number, because 642439179 - 2¹⁶ = 642373643 is a prime.

It is a super-3 number, since 3×642439179³ (a number of 27 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (642439159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22404 + ... + 42270.

It is an arithmetic number, because the mean of its divisors is an integer number (77356058).

Almost surely, 2^642439179 is an apocalyptic number.

642439179 is a deficient number, since it is larger than the sum of its proper divisors (285833517).

642439179 is a wasteful number, since it uses less digits than its factorization.

642439179 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23466 (or 23463 counting only the distinct ones).

The product of its digits is 326592, while the sum is 45.

The square root of 642439179 is about 25346.3839432768. The cubic root of 642439179 is about 862.8672905762.

The spelling of 642439179 in words is "six hundred forty-two million, four hundred thirty-nine thousand, one hundred seventy-nine".