630405994 has 4 divisors (see below), whose sum is σ = 945608994. Its totient is φ = 315202996.

The previous prime is 630405967. The next prime is 630406033. The reversal of 630405994 is 499504036.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 500103769 + 130302225 = 22363^2 + 11415^2 .

It is a super-2 number, since 2×630405994² = 794823434542256072, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157601497 + ... + 157601500.

Almost surely, 2^630405994 is an apocalyptic number.

630405994 is a deficient number, since it is larger than the sum of its proper divisors (315203000).

630405994 is a wasteful number, since it uses less digits than its factorization.

630405994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315202999.

The product of its (nonzero) digits is 116640, while the sum is 40.

The square root of 630405994 is about 25107.8870875269. The cubic root of 630405994 is about 857.4459985203.

The spelling of 630405994 in words is "six hundred thirty million, four hundred five thousand, nine hundred ninety-four".