634845 has 8 divisors (see below), whose sum is σ = 1015776. Its totient is φ = 338576.

The previous prime is 634841. The next prime is 634853. The reversal of 634845 is 548436.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 634845 - 2² = 634841 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (634841) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21147 + ... + 21176.

It is an arithmetic number, because the mean of its divisors is an integer number (126972).

2⁶³⁴⁸⁴⁵ is an apocalyptic number.

It is an amenable number.

634845 is a deficient number, since it is larger than the sum of its proper divisors (380931).

634845 is a wasteful number, since it uses less digits than its factorization.

634845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42331.

The product of its digits is 11520, while the sum is 30.

The square root of 634845 is about 796.7716109400. The cubic root of 634845 is about 85.9453862735.

The spelling of 634845 in words is "six hundred thirty-four thousand, eight hundred forty-five".