621414857 has 8 divisors (see below), whose sum is σ = 712298496. Its totient is φ = 531058752.

The previous prime is 621414853. The next prime is 621414881. The reversal of 621414857 is 758414126.

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

It is not a de Polignac number, because 621414857 - 2² = 621414853 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 621414857.

It is not an unprimeable number, because it can be changed into a prime (621414853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 129353 + ... + 134070.

It is an arithmetic number, because the mean of its divisors is an integer number (89037312).

Almost surely, 2^621414857 is an apocalyptic number.

It is an amenable number.

621414857 is a deficient number, since it is larger than the sum of its proper divisors (90883639).

621414857 is a wasteful number, since it uses less digits than its factorization.

621414857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263767.

The product of its digits is 53760, while the sum is 38.

The square root of 621414857 is about 24928.1940180190. The cubic root of 621414857 is about 853.3500352600.

The spelling of 621414857 in words is "six hundred twenty-one million, four hundred fourteen thousand, eight hundred fifty-seven".