31120040 has 32 divisors (see below), whose sum is σ = 80023680. Its totient is φ = 10669632.

The previous prime is 31120039. The next prime is 31120049. The reversal of 31120040 is 4002113.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (31120049) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55292 + ... + 55851.

It is an arithmetic number, because the mean of its divisors is an integer number (2500740).

Almost surely, 2^31120040 is an apocalyptic number.

It is an amenable number.

31120040 is an abundant number, since it is smaller than the sum of its proper divisors (48903640).

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

31120040 is a wasteful number, since it uses less digits than its factorization.

31120040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111161 (or 111157 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 31120040 is about 5578.5338575651. The cubic root of 31120040 is about 314.5430175469.

Adding to 31120040 its reverse (4002113), we get a palindrome (35122153).

The spelling of 31120040 in words is "thirty-one million, one hundred twenty thousand, forty".