634441986 has 24 divisors (see below), whose sum is σ = 1397925360. Its totient is φ = 207895896.

The previous prime is 634441979. The next prime is 634441987. The reversal of 634441986 is 689144436.

634441986 is a `hidden beast` number, since 634 + 4 + 4 + 1 + 9 + 8 + 6 = 666.

It is not an unprimeable number, because it can be changed into a prime (634441987) 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 11 ways as a sum of consecutive naturals, for example, 297640 + ... + 299763.

It is an arithmetic number, because the mean of its divisors is an integer number (58246890).

Almost surely, 2^634441986 is an apocalyptic number.

634441986 is an abundant number, since it is smaller than the sum of its proper divisors (763483374).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

634441986 is a wasteful number, since it uses less digits than its factorization.

634441986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 597470 (or 597467 counting only the distinct ones).

The product of its digits is 497664, while the sum is 45.

The square root of 634441986 is about 25188.1318481542. The cubic root of 634441986 is about 859.2719573043.

The spelling of 634441986 in words is "six hundred thirty-four million, four hundred forty-one thousand, nine hundred eighty-six".