82421972 has 24 divisors (see below), whose sum is σ = 154187712. Its totient is φ = 38456000.

The previous prime is 82421971. The next prime is 82421987. The reversal of 82421972 is 27912428.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82421971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7154 + ... + 14697.

It is an arithmetic number, because the mean of its divisors is an integer number (6424488).

Almost surely, 2^82421972 is an apocalyptic number.

82421972 is a gapful number since it is divisible by the number (82) formed by its first and last digit.

It is an amenable number.

82421972 is a deficient number, since it is larger than the sum of its proper divisors (71765740).

82421972 is a wasteful number, since it uses less digits than its factorization.

82421972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21919 (or 21917 counting only the distinct ones).

The product of its digits is 16128, while the sum is 35.

The square root of 82421972 is about 9078.6547461615. The cubic root of 82421972 is about 435.1920973032.

The spelling of 82421972 in words is "eighty-two million, four hundred twenty-one thousand, nine hundred seventy-two".