31345140 has 48 divisors (see below), whose sum is σ = 88115328. Its totient is φ = 8325504.

The previous prime is 31345121. The next prime is 31345141. The reversal of 31345140 is 4154313.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31345141) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16689 + ... + 18471.

It is an arithmetic number, because the mean of its divisors is an integer number (1835736).

Almost surely, 2^31345140 is an apocalyptic number.

31345140 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31345140 is an abundant number, since it is smaller than the sum of its proper divisors (56770188).

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

31345140 is a wasteful number, since it uses less digits than its factorization.

31345140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2088 (or 2086 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 31345140 is about 5598.6730570734. The cubic root of 31345140 is about 315.2995890014.

Adding to 31345140 its reverse (4154313), we get a palindrome (35499453).

The spelling of 31345140 in words is "thirty-one million, three hundred forty-five thousand, one hundred forty".