637404 has 12 divisors (see below), whose sum is σ = 1487304. Its totient is φ = 212464.

The previous prime is 637379. The next prime is 637409. The reversal of 637404 is 404736.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (637409) by changing a digit.

637404 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, 26547 + ... + 26570.

It is an arithmetic number, because the mean of its divisors is an integer number (123942).

2⁶³⁷⁴⁰⁴ is an apocalyptic number.

It is an amenable number.

637404 is an abundant number, since it is smaller than the sum of its proper divisors (849900).

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

637404 is a wasteful number, since it uses less digits than its factorization.

637404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53124 (or 53122 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 24.

The square root of 637404 is about 798.3758513382. The cubic root of 637404 is about 86.0607106924.

The spelling of 637404 in words is "six hundred thirty-seven thousand, four hundred four".