634897 has 4 divisors (see below), whose sum is σ = 656820. Its totient is φ = 612976.

The previous prime is 634891. The next prime is 634901. The reversal of 634897 is 798436.

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

It can be written as a sum of positive squares in 2 ways, for example, as 408321 + 226576 = 639^2 + 476^2 .

It is a cyclic number.

It is not a de Polignac number, because 634897 - 2¹⁹ = 110609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (634891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10918 + ... + 10975.

It is an arithmetic number, because the mean of its divisors is an integer number (164205).

2⁶³⁴⁸⁹⁷ is an apocalyptic number.

It is an amenable number.

634897 is a deficient number, since it is larger than the sum of its proper divisors (21923).

634897 is a wasteful number, since it uses less digits than its factorization.

634897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21922.

The product of its digits is 36288, while the sum is 37.

The square root of 634897 is about 796.8042419566. The cubic root of 634897 is about 85.9477327980.

The spelling of 634897 in words is "six hundred thirty-four thousand, eight hundred ninety-seven".