621929390 has 16 divisors (see below), whose sum is σ = 1119827808. Its totient is φ = 248692896.

The previous prime is 621929381. The next prime is 621929393. The reversal of 621929390 is 93929126.

621929390 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×621929390² = 773592332291544200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621929393) 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, 31544 + ... + 47316.

It is an arithmetic number, because the mean of its divisors is an integer number (69989238).

Almost surely, 2^621929390 is an apocalyptic number.

621929390 is a deficient number, since it is larger than the sum of its proper divisors (497898418).

621929390 is a wasteful number, since it uses less digits than its factorization.

621929390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19723.

The product of its (nonzero) digits is 52488, while the sum is 41.

The square root of 621929390 is about 24938.5121849721. The cubic root of 621929390 is about 853.5854955803.

The spelling of 621929390 in words is "six hundred twenty-one million, nine hundred twenty-nine thousand, three hundred ninety".