31403140 has 48 divisors (see below), whose sum is σ = 67766832. Its totient is φ = 12220416.

The previous prime is 31403137. The next prime is 31403147. The reversal of 31403140 is 4130413.

It can be written as a sum of positive squares in 8 ways, for example, as 311364 + 31091776 = 558^2 + 5576^2 .

It is not an unprimeable number, because it can be changed into a prime (31403147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 199942 + ... + 200098.

It is an arithmetic number, because the mean of its divisors is an integer number (1411809).

Almost surely, 2^31403140 is an apocalyptic number.

It is an amenable number.

31403140 is an abundant number, since it is smaller than the sum of its proper divisors (36363692).

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

31403140 is a wasteful number, since it uses less digits than its factorization.

31403140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376 (or 374 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 31403140 is about 5603.8504619592. The cubic root of 31403140 is about 315.4939424513.

Adding to 31403140 its reverse (4130413), we get a palindrome (35533553).

The spelling of 31403140 in words is "thirty-one million, four hundred three thousand, one hundred forty".