421139408 has 20 divisors (see below), whose sum is σ = 858903360. Its totient is φ = 199486944.

The previous prime is 421139401. The next prime is 421139429. The reversal of 421139408 is 804931124.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421139401) 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, 692360 + ... + 692967.

It is an arithmetic number, because the mean of its divisors is an integer number (42945168).

Almost surely, 2^421139408 is an apocalyptic number.

It is an amenable number.

421139408 is an abundant number, since it is smaller than the sum of its proper divisors (437763952).

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

421139408 is a wasteful number, since it uses less digits than its factorization.

421139408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1385354 (or 1385348 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 421139408 is about 20521.6814125939. The cubic root of 421139408 is about 749.5638400314.

The spelling of 421139408 in words is "four hundred twenty-one million, one hundred thirty-nine thousand, four hundred eight".