634642 has 4 divisors (see below), whose sum is σ = 951966. Its totient is φ = 317320.

The previous prime is 634609. The next prime is 634643. The reversal of 634642 is 246436.

634642 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 can be written as a sum of positive squares in only one way, i.e., 385641 + 249001 = 621^2 + 499^2 .

It is not an unprimeable number, because it can be changed into a prime (634643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 158659 + ... + 158662.

2⁶³⁴⁶⁴² is an apocalyptic number.

634642 is a deficient number, since it is larger than the sum of its proper divisors (317324).

634642 is a wasteful number, since it uses less digits than its factorization.

634642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317323.

The product of its digits is 3456, while the sum is 25.

The square root of 634642 is about 796.6442116780. The cubic root of 634642 is about 85.9362245761.

The spelling of 634642 in words is "six hundred thirty-four thousand, six hundred forty-two".