31949940 has 48 divisors (see below), whose sum is σ = 97594560. Its totient is φ = 7745280.

The previous prime is 31949927. The next prime is 31949941. The reversal of 31949940 is 4994913.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31949941) 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, 23545 + ... + 24864.

It is an arithmetic number, because the mean of its divisors is an integer number (2033220).

Almost surely, 2^31949940 is an apocalyptic number.

31949940 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31949940 is an abundant number, since it is smaller than the sum of its proper divisors (65644620).

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

31949940 is a wasteful number, since it uses less digits than its factorization.

31949940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48432 (or 48430 counting only the distinct ones).

The product of its (nonzero) digits is 34992, while the sum is 39.

The square root of 31949940 is about 5652.4277969736. The cubic root of 31949940 is about 317.3145712883.

The spelling of 31949940 in words is "thirty-one million, nine hundred forty-nine thousand, nine hundred forty".