31240044 has 36 divisors (see below), whose sum is σ = 86147880. Its totient is φ = 9466560.

The previous prime is 31240043. The next prime is 31240061. The reversal of 31240044 is 44004213.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 31239999 and 31240026.

It is not an unprimeable number, because it can be changed into a prime (31240043) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39049 + ... + 39840.

Almost surely, 2^31240044 is an apocalyptic number.

It is an amenable number.

31240044 is an abundant number, since it is smaller than the sum of its proper divisors (54907836).

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

31240044 is a wasteful number, since it uses less digits than its factorization.

31240044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78910 (or 78905 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 31240044 is about 5589.2793811009. The cubic root of 31240044 is about 314.9468088569.

Adding to 31240044 its reverse (44004213), we get a palindrome (75244257).

The spelling of 31240044 in words is "thirty-one million, two hundred forty thousand, forty-four".