31134240 has 96 divisors (see below), whose sum is σ = 108984960. Its totient is φ = 8301312.

The previous prime is 31134239. The next prime is 31134251. The reversal of 31134240 is 4243113.

It is a tau number, because it is divible by the number of its divisors (96).

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

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 717 + ... + 7923.

It is an arithmetic number, because the mean of its divisors is an integer number (1135260).

Almost surely, 2^31134240 is an apocalyptic number.

31134240 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31134240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54492480).

31134240 is an abundant number, since it is smaller than the sum of its proper divisors (77850720).

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

31134240 is a wasteful number, since it uses less digits than its factorization.

31134240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7231 (or 7217 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 31134240 is about 5579.8064482561. The cubic root of 31134240 is about 314.5908520149.

Adding to 31134240 its reverse (4243113), we get a palindrome (35377353).

The spelling of 31134240 in words is "thirty-one million, one hundred thirty-four thousand, two hundred forty".