621938193 has 8 divisors (see below), whose sum is σ = 865305408. Its totient is φ = 396598224.

The previous prime is 621938171. The next prime is 621938231. The reversal of 621938193 is 391839126.

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

It is not a de Polignac number, because 621938193 - 2⁸ = 621937937 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (621938113) 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, 4506730 + ... + 4506867.

It is an arithmetic number, because the mean of its divisors is an integer number (108163176).

Almost surely, 2^621938193 is an apocalyptic number.

It is an amenable number.

621938193 is a deficient number, since it is larger than the sum of its proper divisors (243367215).

621938193 is a wasteful number, since it uses less digits than its factorization.

621938193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9013623.

The product of its digits is 69984, while the sum is 42.

The square root of 621938193 is about 24938.6886784370. The cubic root of 621938193 is about 853.5895228744.

The spelling of 621938193 in words is "six hundred twenty-one million, nine hundred thirty-eight thousand, one hundred ninety-three".