637442 has 8 divisors (see below), whose sum is σ = 1029756. Its totient is φ = 294192.

The previous prime is 637423. The next prime is 637447. The reversal of 637442 is 244736.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 564001 + 73441 = 751^2 + 271^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Harshad number since it is a multiple of its sum of digits (26), and also a Moran number because the ratio is a prime number: 24517 = 637442 / (6 + 3 + 7 + 4 + 4 + 2).

It is not an unprimeable number, because it can be changed into a prime (637447) by changing a digit.

637442 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12233 + ... + 12284.

2⁶³⁷⁴⁴² is an apocalyptic number.

637442 is a deficient number, since it is larger than the sum of its proper divisors (392314).

637442 is a wasteful number, since it uses less digits than its factorization.

637442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24532.

The product of its digits is 4032, while the sum is 26.

The square root of 637442 is about 798.3996492985. The cubic root of 637442 is about 86.0624208804.

The spelling of 637442 in words is "six hundred thirty-seven thousand, four hundred forty-two".