31890469 has 6 divisors (see below), whose sum is σ = 34532466. Its totient is φ = 29437200.

The previous prime is 31890407. The next prime is 31890473. The reversal of 31890469 is 96409813.

It can be written as a sum of positive squares in 3 ways, for example, as 1232100 + 30658369 = 1110^2 + 5537^2 .

It is not a de Polignac number, because 31890469 - 2¹⁷ = 31759397 is a prime.

It is a super-2 number, since 2×31890469² = 2034004026079922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31890479) 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 5 ways as a sum of consecutive naturals, for example, 94182 + ... + 94519.

It is an arithmetic number, because the mean of its divisors is an integer number (5755411).

Almost surely, 2^31890469 is an apocalyptic number.

It is an amenable number.

31890469 is a deficient number, since it is larger than the sum of its proper divisors (2641997).

31890469 is a wasteful number, since it uses less digits than its factorization.

31890469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188727 (or 188714 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 31890469 is about 5647.1646868141. The cubic root of 31890469 is about 317.1175679376.

The spelling of 31890469 in words is "thirty-one million, eight hundred ninety thousand, four hundred sixty-nine".