31143040 has 32 divisors (see below), whose sum is σ = 74452860. Its totient is φ = 12456960.

The previous prime is 31143029. The next prime is 31143053. The reversal of 31143040 is 4034113.

It can be written as a sum of positive squares in 2 ways, for example, as 30206016 + 937024 = 5496^2 + 968^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23691 + ... + 24970.

Almost surely, 2^31143040 is an apocalyptic number.

It is an amenable number.

31143040 is an abundant number, since it is smaller than the sum of its proper divisors (43309820).

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

31143040 is an equidigital number, since it uses as much as digits as its factorization.

31143040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48680 (or 48668 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 31143040 is about 5580.5949503615. The cubic root of 31143040 is about 314.6204886113.

Adding to 31143040 its reverse (4034113), we get a palindrome (35177153).

The spelling of 31143040 in words is "thirty-one million, one hundred forty-three thousand, forty".