634387 has 4 divisors (see below), whose sum is σ = 683200. Its totient is φ = 585576.

The previous prime is 634373. The next prime is 634397. The reversal of 634387 is 783436.

634387 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-634387 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (634307) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24387 + ... + 24412.

It is an arithmetic number, because the mean of its divisors is an integer number (170800).

2⁶³⁴³⁸⁷ is an apocalyptic number.

634387 is a deficient number, since it is larger than the sum of its proper divisors (48813).

634387 is a wasteful number, since it uses less digits than its factorization.

634387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48812.

The product of its digits is 12096, while the sum is 31.

The square root of 634387 is about 796.4841492459. The cubic root of 634387 is about 85.9247132711.

The spelling of 634387 in words is "six hundred thirty-four thousand, three hundred eighty-seven".