637974 has 36 divisors (see below), whose sum is σ = 1466556. Its totient is φ = 200376.

The previous prime is 637939. The next prime is 638023. The reversal of 637974 is 479736.

637974 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

637974 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 17 ways as a sum of consecutive naturals, for example, 9489 + ... + 9555.

2⁶³⁷⁹⁷⁴ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 637974, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (733278).

637974 is an abundant number, since it is smaller than the sum of its proper divisors (828582).

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

637974 is a wasteful number, since it uses less digits than its factorization.

637974 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121 (or 95 counting only the distinct ones).

The product of its digits is 31752, while the sum is 36.

The square root of 637974 is about 798.7327462925. The cubic root of 637974 is about 86.0863563791.

The spelling of 637974 in words is "six hundred thirty-seven thousand, nine hundred seventy-four".