621384923 has 8 divisors (see below), whose sum is σ = 625305456. Its totient is φ = 617472000.

The previous prime is 621384913. The next prime is 621384937. The reversal of 621384923 is 329483126.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 621384923 - 2²⁰ = 620336347 is a prime.

It is a super-2 number, since 2×621384923² = 772238445063431858, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (621384913) 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, 307988 + ... + 309998.

It is an arithmetic number, because the mean of its divisors is an integer number (78163182).

Almost surely, 2^621384923 is an apocalyptic number.

621384923 is a deficient number, since it is larger than the sum of its proper divisors (3920533).

621384923 is a wasteful number, since it uses less digits than its factorization.

621384923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3805.

The product of its digits is 62208, while the sum is 38.

The square root of 621384923 is about 24927.5936062830. The cubic root of 621384923 is about 853.3363328786.

The spelling of 621384923 in words is "six hundred twenty-one million, three hundred eighty-four thousand, nine hundred twenty-three".