634043985 has 32 divisors (see below), whose sum is σ = 1075980672. Its totient is φ = 317721600.

The previous prime is 634043983. The next prime is 634043989. The reversal of 634043985 is 589340436.

It is not a de Polignac number, because 634043985 - 2¹ = 634043983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (634043983) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 176982 + ... + 180528.

It is an arithmetic number, because the mean of its divisors is an integer number (33624396).

Almost surely, 2^634043985 is an apocalyptic number.

It is an amenable number.

634043985 is a deficient number, since it is larger than the sum of its proper divisors (441936687).

634043985 is a wasteful number, since it uses less digits than its factorization.

634043985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4273.

The product of its (nonzero) digits is 311040, while the sum is 42.

The square root of 634043985 is about 25180.2300426346. The cubic root of 634043985 is about 859.0922389356.

The spelling of 634043985 in words is "six hundred thirty-four million, forty-three thousand, nine hundred eighty-five".