634998 has 32 divisors (see below), whose sum is σ = 1564416. Its totient is φ = 167328.

The previous prime is 634979. The next prime is 635003. The reversal of 634998 is 899436.

634998 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 634998.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36 + ... + 1127.

It is an arithmetic number, because the mean of its divisors is an integer number (48888).

2⁶³⁴⁹⁹⁸ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 634998, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (782208).

634998 is an abundant number, since it is smaller than the sum of its proper divisors (929418).

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

634998 is a wasteful number, since it uses less digits than its factorization.

634998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1188.

The product of its digits is 46656, while the sum is 39.

The square root of 634998 is about 796.8676176129. The cubic root of 634998 is about 85.9522901046.

The spelling of 634998 in words is "six hundred thirty-four thousand, nine hundred ninety-eight".