634890427 has 4 divisors (see below), whose sum is σ = 635104296. Its totient is φ = 634676560.

The previous prime is 634890397. The next prime is 634890433. The reversal of 634890427 is 724098436.

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 634890427 - 2¹¹ = 634888379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (634890527) 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, 102418 + ... + 108439.

It is an arithmetic number, because the mean of its divisors is an integer number (158776074).

Almost surely, 2^634890427 is an apocalyptic number.

634890427 is a deficient number, since it is larger than the sum of its proper divisors (213869).

634890427 is a wasteful number, since it uses less digits than its factorization.

634890427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213868.

The product of its (nonzero) digits is 290304, while the sum is 43.

The square root of 634890427 is about 25197.0321069764. The cubic root of 634890427 is about 859.4743619539.

The spelling of 634890427 in words is "six hundred thirty-four million, eight hundred ninety thousand, four hundred twenty-seven".