621919412 has 12 divisors (see below), whose sum is σ = 1103268516. Its totient is φ = 306699840.

The previous prime is 621919411. The next prime is 621919423. The reversal of 621919412 is 214919126.

It can be written as a sum of positive squares in 2 ways, for example, as 256192036 + 365727376 = 16006^2 + 19124^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621919411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1064639 + ... + 1065222.

It is an arithmetic number, because the mean of its divisors is an integer number (91939043).

Almost surely, 2^621919412 is an apocalyptic number.

It is an amenable number.

621919412 is a deficient number, since it is larger than the sum of its proper divisors (481349104).

621919412 is a wasteful number, since it uses less digits than its factorization.

621919412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2129938 (or 2129936 counting only the distinct ones).

The product of its digits is 7776, while the sum is 35.

The square root of 621919412 is about 24938.3121321392. The cubic root of 621919412 is about 853.5809306882.

The spelling of 621919412 in words is "six hundred twenty-one million, nine hundred nineteen thousand, four hundred twelve".