621492940 has 24 divisors (see below), whose sum is σ = 1307949552. Its totient is φ = 248061120.

The previous prime is 621492931. The next prime is 621492941. The reversal of 621492940 is 49294126.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 621492940.

It is not an unprimeable number, because it can be changed into a prime (621492941) 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, 23931 + ... + 42610.

It is an arithmetic number, because the mean of its divisors is an integer number (54497898).

Almost surely, 2^621492940 is an apocalyptic number.

It is an amenable number.

621492940 is an abundant number, since it is smaller than the sum of its proper divisors (686456612).

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

621492940 is a wasteful number, since it uses less digits than its factorization.

621492940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67017 (or 67015 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 621492940 is about 24929.7601272054. The cubic root of 621492940 is about 853.3857759247.

The spelling of 621492940 in words is "six hundred twenty-one million, four hundred ninety-two thousand, nine hundred forty".