636231394 has 4 divisors (see below), whose sum is σ = 954347094. Its totient is φ = 318115696.

The previous prime is 636231389. The next prime is 636231413. The reversal of 636231394 is 493132636.

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., 484572169 + 151659225 = 22013^2 + 12315^2 .

It is a super-2 number, since 2×636231394² = 809580773422366472, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159057847 + ... + 159057850.

Almost surely, 2^636231394 is an apocalyptic number.

636231394 is a deficient number, since it is larger than the sum of its proper divisors (318115700).

636231394 is a wasteful number, since it uses less digits than its factorization.

636231394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318115699.

The product of its digits is 69984, while the sum is 37.

The square root of 636231394 is about 25223.6276930976. The cubic root of 636231394 is about 860.0790417706.

The spelling of 636231394 in words is "six hundred thirty-six million, two hundred thirty-one thousand, three hundred ninety-four".