31944618 has 40 divisors (see below), whose sum is σ = 71930628. Its totient is φ = 10596096.

The previous prime is 31944613. The next prime is 31944629. The reversal of 31944618 is 81644913.

31944618 is a `hidden beast` number, since 3 + 194 + 461 + 8 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 30835809 + 1108809 = 5553^2 + 1053^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (31944611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 47130 + ... + 47802.

Almost surely, 2^31944618 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31944618, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35965314).

31944618 is an abundant number, since it is smaller than the sum of its proper divisors (39986010).

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

31944618 is a wasteful number, since it uses less digits than its factorization.

31944618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 980 (or 971 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 31944618 is about 5651.9570062059. The cubic root of 31944618 is about 317.2969516212.

The spelling of 31944618 in words is "thirty-one million, nine hundred forty-four thousand, six hundred eighteen".