621397516 has 12 divisors (see below), whose sum is σ = 1087620688. Its totient is φ = 310648752.

The previous prime is 621397477. The next prime is 621397519. The reversal of 621397516 is 615793126.

It is a super-2 number, since 2×621397516² = 772269745781940512, which contains 22 as substring.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (621397519) 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 3 ways as a sum of consecutive naturals, for example, 39370 + ... + 52846.

Almost surely, 2^621397516 is an apocalyptic number.

It is an amenable number.

621397516 is a deficient number, since it is larger than the sum of its proper divisors (466223172).

621397516 is a wasteful number, since it uses less digits than its factorization.

621397516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25008 (or 25006 counting only the distinct ones).

The product of its digits is 68040, while the sum is 40.

The square root of 621397516 is about 24927.8461965730. The cubic root of 621397516 is about 853.3420974170.

The spelling of 621397516 in words is "six hundred twenty-one million, three hundred ninety-seven thousand, five hundred sixteen".