31969140 has 96 divisors (see below), whose sum is σ = 103434240. Its totient is φ = 7226496.

The previous prime is 31969127. The next prime is 31969141. The reversal of 31969140 is 4196913.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31969141) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 42891 + ... + 43629.

It is an arithmetic number, because the mean of its divisors is an integer number (1077440).

Almost surely, 2^31969140 is an apocalyptic number.

31969140 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31969140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51717120).

31969140 is an abundant number, since it is smaller than the sum of its proper divisors (71465100).

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

31969140 is a wasteful number, since it uses less digits than its factorization.

31969140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 861 (or 859 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 33.

The square root of 31969140 is about 5654.1259271438. The cubic root of 31969140 is about 317.3781209098.

The spelling of 31969140 in words is "thirty-one million, nine hundred sixty-nine thousand, one hundred forty".