72021940 has 24 divisors (see below), whose sum is σ = 151859232. Its totient is φ = 28692000.

The previous prime is 72021889. The next prime is 72021967. The reversal of 72021940 is 4912027.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2154 + ... + 12193.

It is an arithmetic number, because the mean of its divisors is an integer number (6327468).

Almost surely, 2^72021940 is an apocalyptic number.

It is an amenable number.

72021940 is an abundant number, since it is smaller than the sum of its proper divisors (79837292).

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

72021940 is a wasteful number, since it uses less digits than its factorization.

72021940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14607 (or 14605 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 72021940 is about 8486.5741026636. The cubic root of 72021940 is about 416.0590168366.

Adding to 72021940 its reverse (4912027), we get a palindrome (76933967).

The spelling of 72021940 in words is "seventy-two million, twenty-one thousand, nine hundred forty".