421981536 has 24 divisors (see below), whose sum is σ = 1107701784. Its totient is φ = 140660480.

The previous prime is 421981513. The next prime is 421981543. The reversal of 421981536 is 635189124.

It is a tau number, because it is divible by the number of its divisors (24).

It is a junction number, because it is equal to n+sod(n) for n = 421981494 and 421981503.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2197725 + ... + 2197916.

It is an arithmetic number, because the mean of its divisors is an integer number (46154241).

Almost surely, 2^421981536 is an apocalyptic number.

It is an amenable number.

421981536 is an abundant number, since it is smaller than the sum of its proper divisors (685720248).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

421981536 is a wasteful number, since it uses less digits than its factorization.

421981536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4395654 (or 4395646 counting only the distinct ones).

The product of its digits is 51840, while the sum is 39.

The square root of 421981536 is about 20542.1891725298. The cubic root of 421981536 is about 750.0631271309.

It can be divided in two parts, 42198 and 1536, that added together give a palindrome (43734).

The spelling of 421981536 in words is "four hundred twenty-one million, nine hundred eighty-one thousand, five hundred thirty-six".