421617840 has 80 divisors (see below), whose sum is σ = 1493737728. Its totient is φ = 96369408.

The previous prime is 421617829. The next prime is 421617841. The reversal of 421617840 is 48716124.

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (421617841) 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, 123802 + ... + 127161.

Almost surely, 2^421617840 is an apocalyptic number.

421617840 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

421617840 is an abundant number, since it is smaller than the sum of its proper divisors (1072119888).

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

421617840 is a wasteful number, since it uses less digits than its factorization.

421617840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250986 (or 250980 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 33.

The square root of 421617840 is about 20533.3348484848. The cubic root of 421617840 is about 749.8475779143.

The spelling of 421617840 in words is "four hundred twenty-one million, six hundred seventeen thousand, eight hundred forty".