634249843 has 4 divisors (see below), whose sum is σ = 634304248. Its totient is φ = 634195440.

The previous prime is 634249831. The next prime is 634249853. The reversal of 634249843 is 348942436.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 634249843 - 2²¹ = 632152691 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 634249843.

It is not an unprimeable number, because it can be changed into a prime (634249853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1821 + ... + 35662.

It is an arithmetic number, because the mean of its divisors is an integer number (158576062).

Almost surely, 2^634249843 is an apocalyptic number.

634249843 is a deficient number, since it is larger than the sum of its proper divisors (54405).

634249843 is a wasteful number, since it uses less digits than its factorization.

634249843 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54404.

The product of its digits is 497664, while the sum is 43.

The square root of 634249843 is about 25184.3174019071. The cubic root of 634249843 is about 859.1852040285.

The spelling of 634249843 in words is "six hundred thirty-four million, two hundred forty-nine thousand, eight hundred forty-three".