631900390 has 32 divisors (see below), whose sum is σ = 1294776576. Its totient is φ = 219790560.

The previous prime is 631900361. The next prime is 631900391. The reversal of 631900390 is 93009136.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631900391) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 122352 + ... + 127411.

It is an arithmetic number, because the mean of its divisors is an integer number (40461768).

Almost surely, 2^631900390 is an apocalyptic number.

631900390 is an abundant number, since it is smaller than the sum of its proper divisors (662876186).

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

631900390 is a wasteful number, since it uses less digits than its factorization.

631900390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249804.

The product of its (nonzero) digits is 4374, while the sum is 31.

The square root of 631900390 is about 25137.6289653579. The cubic root of 631900390 is about 858.1229975285.

The spelling of 631900390 in words is "six hundred thirty-one million, nine hundred thousand, three hundred ninety".