621857393 has 8 divisors (see below), whose sum is σ = 627380160. Its totient is φ = 616346640.

The previous prime is 621857377. The next prime is 621857459. The reversal of 621857393 is 393758126.

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 621857393 - 2⁴ = 621857377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (621457393) 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, 124223 + ... + 129131.

It is an arithmetic number, because the mean of its divisors is an integer number (78422520).

Almost surely, 2^621857393 is an apocalyptic number.

It is an amenable number.

621857393 is a deficient number, since it is larger than the sum of its proper divisors (5522767).

621857393 is a wasteful number, since it uses less digits than its factorization.

621857393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6007.

The product of its digits is 272160, while the sum is 44.

The square root of 621857393 is about 24937.0686529111. The cubic root of 621857393 is about 853.5525561676.

The spelling of 621857393 in words is "six hundred twenty-one million, eight hundred fifty-seven thousand, three hundred ninety-three".