421199990 has 16 divisors (see below), whose sum is σ = 802757952. Its totient is φ = 158569344.

The previous prime is 421199959. The next prime is 421199993. The reversal of 421199990 is 99991124.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421199993) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1238654 + ... + 1238993.

It is an arithmetic number, because the mean of its divisors is an integer number (50172372).

Almost surely, 2^421199990 is an apocalyptic number.

421199990 is a deficient number, since it is larger than the sum of its proper divisors (381557962).

421199990 is a wasteful number, since it uses less digits than its factorization.

421199990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2477671.

The product of its (nonzero) digits is 52488, while the sum is 44.

The square root of 421199990 is about 20523.1574081573. The cubic root of 421199990 is about 749.5997805446.

The spelling of 421199990 in words is "four hundred twenty-one million, one hundred ninety-nine thousand, nine hundred ninety".