421908990 has 32 divisors (see below), whose sum is σ = 1017735840. Its totient is φ = 111936384.

The previous prime is 421908979. The next prime is 421908997. The reversal of 421908990 is 99809124.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421908997) 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 15 ways as a sum of consecutive naturals, for example, 29785 + ... + 41604.

It is an arithmetic number, because the mean of its divisors is an integer number (31804245).

Almost surely, 2^421908990 is an apocalyptic number.

421908990 is an abundant number, since it is smaller than the sum of its proper divisors (595826850).

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

421908990 is a wasteful number, since it uses less digits than its factorization.

421908990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71596.

The product of its (nonzero) digits is 46656, while the sum is 42.

The square root of 421908990 is about 20540.4233159884. The cubic root of 421908990 is about 750.0201416813.

The spelling of 421908990 in words is "four hundred twenty-one million, nine hundred eight thousand, nine hundred ninety".