31443442 has 16 divisors (see below), whose sum is σ = 49944960. Its totient is φ = 14805072.

The previous prime is 31443409. The next prime is 31443443. The reversal of 31443442 is 24434413.

It is not an unprimeable number, because it can be changed into a prime (31443443) 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 7 ways as a sum of consecutive naturals, for example, 4183 + ... + 8965.

It is an arithmetic number, because the mean of its divisors is an integer number (3121560).

Almost surely, 2^31443442 is an apocalyptic number.

31443442 is a deficient number, since it is larger than the sum of its proper divisors (18501518).

31443442 is a wasteful number, since it uses less digits than its factorization.

31443442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4977.

The product of its digits is 4608, while the sum is 25.

The square root of 31443442 is about 5607.4452293357. The cubic root of 31443442 is about 315.6288504187.

Adding to 31443442 its reverse (24434413), we get a palindrome (55877855).

The spelling of 31443442 in words is "thirty-one million, four hundred forty-three thousand, four hundred forty-two".