472691639 has 4 divisors (see below), whose sum is σ = 540219024. Its totient is φ = 405164256.

The previous prime is 472691621. The next prime is 472691641. The reversal of 472691639 is 936196274.

It is a happy number.

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

It is not a de Polignac number, because 472691639 - 2²⁸ = 204256183 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 472691593 and 472691602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (472691669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33763682 + ... + 33763695.

It is an arithmetic number, because the mean of its divisors is an integer number (135054756).

Almost surely, 2^472691639 is an apocalyptic number.

472691639 is a deficient number, since it is larger than the sum of its proper divisors (67527385).

472691639 is an equidigital number, since it uses as much as digits as its factorization.

472691639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67527384.

The product of its digits is 489888, while the sum is 47.

The square root of 472691639 is about 21741.4727881991. The cubic root of 472691639 is about 778.9794009789.

The spelling of 472691639 in words is "four hundred seventy-two million, six hundred ninety-one thousand, six hundred thirty-nine".