31380472 has 8 divisors (see below), whose sum is σ = 58838400. Its totient is φ = 15690232.

The previous prime is 31380467. The next prime is 31380473. The reversal of 31380472 is 27408313.

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 31380472.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31380473) 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 as a sum of consecutive naturals, namely, 1961272 + ... + 1961287.

It is an arithmetic number, because the mean of its divisors is an integer number (7354800).

Almost surely, 2^31380472 is an apocalyptic number.

It is an amenable number.

31380472 is a deficient number, since it is larger than the sum of its proper divisors (27457928).

31380472 is a wasteful number, since it uses less digits than its factorization.

31380472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3922565 (or 3922561 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 31380472 is about 5601.8275589311. The cubic root of 31380472 is about 315.4180122721.

Adding to 31380472 its reverse (27408313), we get a palindrome (58788785).

The spelling of 31380472 in words is "thirty-one million, three hundred eighty thousand, four hundred seventy-two".