634906 has 4 divisors (see below), whose sum is σ = 952362. Its totient is φ = 317452.

The previous prime is 634903. The next prime is 634927. The reversal of 634906 is 609436.

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., 342225 + 292681 = 585^2 + 541^2 .

It is not an unprimeable number, because it can be changed into a prime (634901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 158725 + ... + 158728.

2⁶³⁴⁹⁰⁶ is an apocalyptic number.

634906 is a deficient number, since it is larger than the sum of its proper divisors (317456).

634906 is a wasteful number, since it uses less digits than its factorization.

634906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317455.

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 634906 is about 796.8098894969. The cubic root of 634906 is about 85.9481389143.

It can be divided in two parts, 634 and 906, that added together give a triangular number (1540 = T₅₅).

The spelling of 634906 in words is "six hundred thirty-four thousand, nine hundred six".