639841466 has 24 divisors (see below), whose sum is σ = 1063050912. Its totient is φ = 288602600.

The previous prime is 639841463. The next prime is 639841483. The reversal of 639841466 is 664148936.

It is a super-2 number, since 2×639841466² = 818794203226058312, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 639841466.

It is not an unprimeable number, because it can be changed into a prime (639841463) 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, 21611 + ... + 41793.

It is an arithmetic number, because the mean of its divisors is an integer number (44293788).

Almost surely, 2^639841466 is an apocalyptic number.

639841466 is a deficient number, since it is larger than the sum of its proper divisors (423209446).

639841466 is a wasteful number, since it uses less digits than its factorization.

639841466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20338 (or 20327 counting only the distinct ones).

The product of its digits is 746496, while the sum is 47.

The square root of 639841466 is about 25295.0877839947. The cubic root of 639841466 is about 861.7027136472.

The spelling of 639841466 in words is "six hundred thirty-nine million, eight hundred forty-one thousand, four hundred sixty-six".