637494 has 32 divisors (see below), whose sum is σ = 1499904. Its totient is φ = 178080.

The previous prime is 637489. The next prime is 637499. The reversal of 637494 is 494736.

It is an interprime number because it is at equal distance from previous prime (637489) and next prime (637499).

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (637499) by changing a digit.

637494 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 487 + ... + 1229.

It is an arithmetic number, because the mean of its divisors is an integer number (46872).

2⁶³⁷⁴⁹⁴ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 637494, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (749952).

637494 is an abundant number, since it is smaller than the sum of its proper divisors (862410).

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

637494 is a wasteful number, since it uses less digits than its factorization.

637494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 772.

The product of its digits is 18144, while the sum is 33.

The square root of 637494 is about 798.4322137790. The cubic root of 637494 is about 86.0647610275.

It can be divided in two parts, 63 and 7494, that added together give a palindrome (7557).

The spelling of 637494 in words is "six hundred thirty-seven thousand, four hundred ninety-four".