421636523 has 16 divisors (see below), whose sum is σ = 536409600. Its totient is φ = 328545000.

The previous prime is 421636517. The next prime is 421636541. The reversal of 421636523 is 325636124.

It is not a de Polignac number, because 421636523 - 2¹⁶ = 421570987 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 421636523.

It is not an unprimeable number, because it can be changed into a prime (421636573) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52103 + ... + 59648.

It is an arithmetic number, because the mean of its divisors is an integer number (33525600).

Almost surely, 2^421636523 is an apocalyptic number.

421636523 is a deficient number, since it is larger than the sum of its proper divisors (114773077).

421636523 is a wasteful number, since it uses less digits than its factorization.

421636523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111783 (or 111769 counting only the distinct ones).

The product of its digits is 25920, while the sum is 32.

The square root of 421636523 is about 20533.7897865932. The cubic root of 421636523 is about 749.8586536596.

The spelling of 421636523 in words is "four hundred twenty-one million, six hundred thirty-six thousand, five hundred twenty-three".