421972988 has 6 divisors (see below), whose sum is σ = 738452736. Its totient is φ = 210986492.

The previous prime is 421972987. The next prime is 421973021. The reversal of 421972988 is 889279124.

It is a super-2 number, since 2×421972988² = 356122405203296288, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421972981) 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 as a sum of consecutive naturals, namely, 52746620 + ... + 52746627.

It is an arithmetic number, because the mean of its divisors is an integer number (123075456).

Almost surely, 2^421972988 is an apocalyptic number.

It is an amenable number.

421972988 is a deficient number, since it is larger than the sum of its proper divisors (316479748).

421972988 is a wasteful number, since it uses less digits than its factorization.

421972988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105493251 (or 105493249 counting only the distinct ones).

The product of its digits is 580608, while the sum is 50.

The square root of 421972988 is about 20541.9811118597. The cubic root of 421972988 is about 750.0580624678.

The spelling of 421972988 in words is "four hundred twenty-one million, nine hundred seventy-two thousand, nine hundred eighty-eight".