8421972 has 24 divisors (see below), whose sum is σ = 21163296. Its totient is φ = 2591328.

The previous prime is 8421971. The next prime is 8421983. The reversal of 8421972 is 2791248.

It is a happy number.

It is a super-2 number, since 2×8421972² = 141859224737568, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8421971) 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, 26838 + ... + 27149.

It is an arithmetic number, because the mean of its divisors is an integer number (881804).

Almost surely, 2^8421972 is an apocalyptic number.

It is an amenable number.

8421972 is an abundant number, since it is smaller than the sum of its proper divisors (12741324).

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

8421972 is a wasteful number, since it uses less digits than its factorization.

8421972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54007 (or 54005 counting only the distinct ones).

The product of its digits is 8064, while the sum is 33.

The square root of 8421972 is about 2902.0634038560. The cubic root of 8421972 is about 203.4563572153.

The spelling of 8421972 in words is "eight million, four hundred twenty-one thousand, nine hundred seventy-two".