31424140 has 24 divisors (see below), whose sum is σ = 71990352. Its totient is φ = 11426880.

The previous prime is 31424117. The next prime is 31424171. The reversal of 31424140 is 4142413.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71199 + ... + 71638.

It is an arithmetic number, because the mean of its divisors is an integer number (2999598).

Almost surely, 2^31424140 is an apocalyptic number.

It is an amenable number.

31424140 is an abundant number, since it is smaller than the sum of its proper divisors (40566212).

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

31424140 is a wasteful number, since it uses less digits than its factorization.

31424140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142857 (or 142855 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 31424140 is about 5605.7238604840. The cubic root of 31424140 is about 315.5642527928.

Adding to 31424140 its reverse (4142413), we get a palindrome (35566553).

The spelling of 31424140 in words is "thirty-one million, four hundred twenty-four thousand, one hundred forty".