637943442 has 16 divisors (see below), whose sum is σ = 1305559200. Its totient is φ = 207702432.

The previous prime is 637943431. The next prime is 637943447. The reversal of 637943442 is 244349736.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 637943394 and 637943403.

It is not an unprimeable number, because it can be changed into a prime (637943447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1236067 + ... + 1236582.

It is an arithmetic number, because the mean of its divisors is an integer number (81597450).

Almost surely, 2^637943442 is an apocalyptic number.

637943442 is an abundant number, since it is smaller than the sum of its proper divisors (667615758).

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

637943442 is a wasteful number, since it uses less digits than its factorization.

637943442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2472697.

The product of its digits is 435456, while the sum is 42.

The square root of 637943442 is about 25257.5422794855. The cubic root of 637943442 is about 860.8498188798.

The spelling of 637943442 in words is "six hundred thirty-seven million, nine hundred forty-three thousand, four hundred forty-two".