31867940 has 48 divisors (see below), whose sum is σ = 75875520. Its totient is φ = 11145600.

The previous prime is 31867939. The next prime is 31867943. The reversal of 31867940 is 4976813.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a junction number, because it is equal to n+sod(n) for n = 31867894 and 31867903.

It is not an unprimeable number, because it can be changed into a prime (31867943) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1715 + ... + 8165.

It is an arithmetic number, because the mean of its divisors is an integer number (1580740).

Almost surely, 2^31867940 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31867940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37937760).

31867940 is an abundant number, since it is smaller than the sum of its proper divisors (44007580).

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

31867940 is a wasteful number, since it uses less digits than its factorization.

31867940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6492 (or 6490 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 31867940 is about 5645.1696165837. The cubic root of 31867940 is about 317.0428745162.

The spelling of 31867940 in words is "thirty-one million, eight hundred sixty-seven thousand, nine hundred forty".