634919 has 4 divisors (see below), whose sum is σ = 637944. Its totient is φ = 631896.

The previous prime is 634903. The next prime is 634927. The reversal of 634919 is 919436.

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

It is a cyclic number.

It is not a de Polignac number, because 634919 - 2⁴ = 634903 is a prime.

It is a super-2 number, since 2×634919² = 806244273122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (634939) 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, 1172 + ... + 1625.

It is an arithmetic number, because the mean of its divisors is an integer number (159486).

2⁶³⁴⁹¹⁹ is an apocalyptic number.

634919 is a deficient number, since it is larger than the sum of its proper divisors (3025).

634919 is a wasteful number, since it uses less digits than its factorization.

634919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3024.

The product of its digits is 5832, while the sum is 32.

The square root of 634919 is about 796.8180469844. The cubic root of 634919 is about 85.9487255198.

The spelling of 634919 in words is "six hundred thirty-four thousand, nine hundred nineteen".