631426 has 8 divisors (see below), whose sum is σ = 950544. Its totient is φ = 314580.

The previous prime is 631409. The next prime is 631429. The reversal of 631426 is 624136.

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

It is a junction number, because it is equal to n+sod(n) for n = 631397 and 631406.

It is not an unprimeable number, because it can be changed into a prime (631429) by changing a digit.

631426 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 (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 661 + ... + 1303.

It is an arithmetic number, because the mean of its divisors is an integer number (118818).

2⁶³¹⁴²⁶ is an apocalyptic number.

631426 is a deficient number, since it is larger than the sum of its proper divisors (319118).

631426 is a wasteful number, since it uses less digits than its factorization.

631426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1136.

The product of its digits is 864, while the sum is 22.

The square root of 631426 is about 794.6231811368. The cubic root of 631426 is about 85.7908202661.

The spelling of 631426 in words is "six hundred thirty-one thousand, four hundred twenty-six".