31463440 has 40 divisors (see below), whose sum is σ = 73388160. Its totient is φ = 12544896.

The previous prime is 31463429. The next prime is 31463459. The reversal of 31463440 is 4436413.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43401 + ... + 44119.

It is an arithmetic number, because the mean of its divisors is an integer number (1834704).

Almost surely, 2^31463440 is an apocalyptic number.

It is an amenable number.

31463440 is an abundant number, since it is smaller than the sum of its proper divisors (41924720).

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

31463440 is a wasteful number, since it uses less digits than its factorization.

31463440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1279 (or 1273 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 25.

The square root of 31463440 is about 5609.2281108901. The cubic root of 31463440 is about 315.6957494570.

Adding to 31463440 its reverse (4436413), we get a palindrome (35899853).

The spelling of 31463440 in words is "thirty-one million, four hundred sixty-three thousand, four hundred forty".