621998372 has 12 divisors (see below), whose sum is σ = 1115046156. Its totient is φ = 303413760.

The previous prime is 621998371. The next prime is 621998401. The reversal of 621998372 is 273899126.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 337603876 + 284394496 = 18374^2 + 16864^2 .

It is not an unprimeable number, because it can be changed into a prime (621998371) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1896173 + ... + 1896500.

It is an arithmetic number, because the mean of its divisors is an integer number (92920513).

Almost surely, 2^621998372 is an apocalyptic number.

It is an amenable number.

621998372 is a deficient number, since it is larger than the sum of its proper divisors (493047784).

621998372 is a wasteful number, since it uses less digits than its factorization.

621998372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3792718 (or 3792716 counting only the distinct ones).

The product of its digits is 326592, while the sum is 47.

The square root of 621998372 is about 24939.8951882320. The cubic root of 621998372 is about 853.6170532130.

The spelling of 621998372 in words is "six hundred twenty-one million, nine hundred ninety-eight thousand, three hundred seventy-two".