621409398 has 16 divisors (see below), whose sum is σ = 1315926000. Its totient is φ = 194951936.

The previous prime is 621409391. The next prime is 621409427. The reversal of 621409398 is 893904126.

621409398 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 2×621409398² = 772299279845444808, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621409391) 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, 3046023 + ... + 3046226.

It is an arithmetic number, because the mean of its divisors is an integer number (82245375).

Almost surely, 2^621409398 is an apocalyptic number.

621409398 is an abundant number, since it is smaller than the sum of its proper divisors (694516602).

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

621409398 is a wasteful number, since it uses less digits than its factorization.

621409398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6092271.

The product of its (nonzero) digits is 93312, while the sum is 42.

The square root of 621409398 is about 24928.0845232842. The cubic root of 621409398 is about 853.3475364186.

The spelling of 621409398 in words is "six hundred twenty-one million, four hundred nine thousand, three hundred ninety-eight".