31949240 has 32 divisors (see below), whose sum is σ = 72182880. Its totient is φ = 12726912.

The previous prime is 31949233. The next prime is 31949243. The reversal of 31949240 is 4294913.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 31949197 and 31949206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31949243) 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 7 ways as a sum of consecutive naturals, for example, 9002 + ... + 12038.

It is an arithmetic number, because the mean of its divisors is an integer number (2255715).

Almost surely, 2^31949240 is an apocalyptic number.

It is an amenable number.

31949240 is an abundant number, since it is smaller than the sum of its proper divisors (40233640).

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

31949240 is a wasteful number, since it uses less digits than its factorization.

31949240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3311 (or 3307 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 31949240 is about 5652.3658763389. The cubic root of 31949240 is about 317.3122538941.

The spelling of 31949240 in words is "thirty-one million, nine hundred forty-nine thousand, two hundred forty".