31890194 has 8 divisors (see below), whose sum is σ = 54668928. Its totient is φ = 13667220.

The previous prime is 31890193. The next prime is 31890203. The reversal of 31890194 is 49109813.

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

It is not an unprimeable number, because it can be changed into a prime (31890193) 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 3 ways as a sum of consecutive naturals, for example, 1138922 + ... + 1138949.

It is an arithmetic number, because the mean of its divisors is an integer number (6833616).

Almost surely, 2^31890194 is an apocalyptic number.

31890194 is a deficient number, since it is larger than the sum of its proper divisors (22778734).

31890194 is a wasteful number, since it uses less digits than its factorization.

31890194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2277880.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 31890194 is about 5647.1403382597. The cubic root of 31890194 is about 317.1166564053.

The spelling of 31890194 in words is "thirty-one million, eight hundred ninety thousand, one hundred ninety-four".