637940 has 24 divisors (see below), whose sum is σ = 1354752. Its totient is φ = 252320.

The previous prime is 637939. The next prime is 638023. The reversal of 637940 is 49736.

It is a congruent number.

It is an unprimeable number.

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, 3245 + ... + 3435.

It is an arithmetic number, because the mean of its divisors is an integer number (56448).

2⁶³⁷⁹⁴⁰ is an apocalyptic number.

It is an amenable number.

637940 is an abundant number, since it is smaller than the sum of its proper divisors (716812).

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

637940 is a wasteful number, since it uses less digits than its factorization.

637940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 367 (or 365 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 29.

The square root of 637940 is about 798.7114622941. The cubic root of 637940 is about 86.0848270649.

The spelling of 637940 in words is "six hundred thirty-seven thousand, nine hundred forty".