634843842 has 16 divisors (see below), whose sum is σ = 1285760640. Its totient is φ = 208935792.

The previous prime is 634843841. The next prime is 634843927. The reversal of 634843842 is 248348436.

It is a junction number, because it is equal to n+sod(n) for n = 634843794 and 634843803.

It is not an unprimeable number, because it can be changed into a prime (634843841) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 669193 + ... + 670140.

It is an arithmetic number, because the mean of its divisors is an integer number (80360040).

Almost surely, 2^634843842 is an apocalyptic number.

634843842 is an abundant number, since it is smaller than the sum of its proper divisors (650916798).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

634843842 is a wasteful number, since it uses less digits than its factorization.

634843842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1339417.

The product of its digits is 442368, while the sum is 42.

The square root of 634843842 is about 25196.1076755915. The cubic root of 634843842 is about 859.4533401676.

The spelling of 634843842 in words is "six hundred thirty-four million, eight hundred forty-three thousand, eight hundred forty-two".