621444859 has 12 divisors (see below), whose sum is σ = 729889104. Its totient is φ = 517936032.

The previous prime is 621444829. The next prime is 621444907. The reversal of 621444859 is 958444126.

It is a de Polignac number, because none of the positive numbers 2^k-621444859 is a prime.

It is not an unprimeable number, because it can be changed into a prime (621444829) 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, 400417 + ... + 401965.

It is an arithmetic number, because the mean of its divisors is an integer number (60824092).

Almost surely, 2^621444859 is an apocalyptic number.

621444859 is a deficient number, since it is larger than the sum of its proper divisors (108444245).

621444859 is an frugal number, since it uses more digits than its factorization.

621444859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3142 (or 1593 counting only the distinct ones).

The product of its digits is 276480, while the sum is 43.

The square root of 621444859 is about 24928.7957791787. The cubic root of 621444859 is about 853.3637683271.

The spelling of 621444859 in words is "six hundred twenty-one million, four hundred forty-four thousand, eight hundred fifty-nine".