31370040 has 96 divisors (see below), whose sum is σ = 109811520. Its totient is φ = 7720704.

The previous prime is 31370039. The next prime is 31370057. The reversal of 31370040 is 4007313.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 31369995 and 31370022.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1329 + ... + 8031.

It is an arithmetic number, because the mean of its divisors is an integer number (1143870).

Almost surely, 2^31370040 is an apocalyptic number.

31370040 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 31370040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54905760).

31370040 is an abundant number, since it is smaller than the sum of its proper divisors (78441480).

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

31370040 is a wasteful number, since it uses less digits than its factorization.

31370040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6733 (or 6726 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 18.

The square root of 31370040 is about 5600.8963568343. The cubic root of 31370040 is about 315.3830562927.

Adding to 31370040 its reverse (4007313), we get a palindrome (35377353).

The spelling of 31370040 in words is "thirty-one million, three hundred seventy thousand, forty".