31990449 has 16 divisors (see below), whose sum is σ = 43704000. Its totient is φ = 20807616.

The previous prime is 31990421. The next prime is 31990487. The reversal of 31990449 is 94409913.

It is not a de Polignac number, because 31990449 - 2¹⁶ = 31924913 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (31990489) 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, 25767 + ... + 26979.

It is an arithmetic number, because the mean of its divisors is an integer number (2731500).

Almost surely, 2^31990449 is an apocalyptic number.

It is an amenable number.

31990449 is a deficient number, since it is larger than the sum of its proper divisors (11713551).

31990449 is a wasteful number, since it uses less digits than its factorization.

31990449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1424.

The product of its (nonzero) digits is 34992, while the sum is 39.

The square root of 31990449 is about 5656.0099893830. The cubic root of 31990449 is about 317.4486212768.

The spelling of 31990449 in words is "thirty-one million, nine hundred ninety thousand, four hundred forty-nine".