31132740 has 48 divisors (see below), whose sum is σ = 87458112. Its totient is φ = 8274816.

The previous prime is 31132721. The next prime is 31132741. The reversal of 31132740 is 4723113.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31132741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23167 + ... + 24473.

It is an arithmetic number, because the mean of its divisors is an integer number (1822044).

Almost surely, 2^31132740 is an apocalyptic number.

31132740 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31132740 is an abundant number, since it is smaller than the sum of its proper divisors (56325372).

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

31132740 is a wasteful number, since it uses less digits than its factorization.

31132740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1716 (or 1714 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 21.

The square root of 31132740 is about 5579.6720333726. The cubic root of 31132740 is about 314.5857997653.

Adding to 31132740 its reverse (4723113), we get a palindrome (35855853).

The spelling of 31132740 in words is "thirty-one million, one hundred thirty-two thousand, seven hundred forty".