31990002 has 32 divisors (see below), whose sum is σ = 70286400. Its totient is φ = 9625920.

The previous prime is 31989983. The next prime is 31990003. The reversal of 31990002 is 20009913.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (31990003) by changing a digit.

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, 8208 + ... + 11460.

It is an arithmetic number, because the mean of its divisors is an integer number (2196450).

Almost surely, 2^31990002 is an apocalyptic number.

31990002 is an abundant number, since it is smaller than the sum of its proper divisors (38296398).

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

31990002 is a wasteful number, since it uses less digits than its factorization.

31990002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3418.

The product of its (nonzero) digits is 486, while the sum is 24.

The square root of 31990002 is about 5655.9704737560. The cubic root of 31990002 is about 317.4471427085.

Adding to 31990002 its reverse (20009913), we get a palindrome (51999915).

The spelling of 31990002 in words is "thirty-one million, nine hundred ninety thousand, two".