31740140 has 12 divisors (see below), whose sum is σ = 66654336. Its totient is φ = 12696048.

The previous prime is 31740131. The next prime is 31740143. The reversal of 31740140 is 4104713.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 1587007 = 31740140 / (3 + 1 + 7 + 4 + 0 + 1 + 4 + 0).

It is not an unprimeable number, because it can be changed into a prime (31740143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 793484 + ... + 793523.

It is an arithmetic number, because the mean of its divisors is an integer number (5554528).

Almost surely, 2^31740140 is an apocalyptic number.

It is an amenable number.

31740140 is an abundant number, since it is smaller than the sum of its proper divisors (34914196).

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

31740140 is a wasteful number, since it uses less digits than its factorization.

31740140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1587016 (or 1587014 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 31740140 is about 5633.8388333356. The cubic root of 31740140 is about 316.6184943651.

Adding to 31740140 its reverse (4104713), we get a palindrome (35844853).

The spelling of 31740140 in words is "thirty-one million, seven hundred forty thousand, one hundred forty".