634390 has 8 divisors (see below), whose sum is σ = 1141920. Its totient is φ = 253752.

The previous prime is 634373. The next prime is 634397. The reversal of 634390 is 93436.

634390 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (634397) by changing a digit.

634390 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, 31710 + ... + 31729.

It is an arithmetic number, because the mean of its divisors is an integer number (142740).

2⁶³⁴³⁹⁰ is an apocalyptic number.

634390 is a deficient number, since it is larger than the sum of its proper divisors (507530).

634390 is a wasteful number, since it uses less digits than its factorization.

634390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63446.

The product of its (nonzero) digits is 1944, while the sum is 25.

The square root of 634390 is about 796.4860325203. The cubic root of 634390 is about 85.9248487161.

It can be divided in two parts, 634 and 390, that added together give a 10-th power (1024 = 2¹⁰).

The spelling of 634390 in words is "six hundred thirty-four thousand, three hundred ninety".