621383409 has 12 divisors (see below), whose sum is σ = 910196352. Its totient is φ = 408420600.

The previous prime is 621383363. The next prime is 621383419. The reversal of 621383409 is 904383126.

It is not a de Polignac number, because 621383409 - 2⁷ = 621383281 is a prime.

It is a super-2 number, since 2×621383409² = 772234681960922562, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (621383419) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 485577 + ... + 486854.

It is an arithmetic number, because the mean of its divisors is an integer number (75849696).

Almost surely, 2^621383409 is an apocalyptic number.

It is an amenable number.

621383409 is a deficient number, since it is larger than the sum of its proper divisors (288812943).

621383409 is a wasteful number, since it uses less digits than its factorization.

621383409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 972508 (or 972505 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 621383409 is about 24927.5632383111. The cubic root of 621383409 is about 853.3356398287.

The spelling of 621383409 in words is "six hundred twenty-one million, three hundred eighty-three thousand, four hundred nine".