31180380 has 192 divisors, whose sum is σ = 115540992. Its totient is φ = 6082560.

The previous prime is 31180367. The next prime is 31180421. The reversal of 31180380 is 8308113.

It is a self number, because there is not a number n which added to its sum of digits gives 31180380.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 78342 + ... + 78738.

It is an arithmetic number, because the mean of its divisors is an integer number (601776).

Almost surely, 2^31180380 is an apocalyptic number.

31180380 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 31180380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (57770496).

31180380 is an abundant number, since it is smaller than the sum of its proper divisors (84360612).

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

31180380 is a wasteful number, since it uses less digits than its factorization.

31180380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 444 (or 442 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 31180380 is about 5583.9394695860. The cubic root of 31180380 is about 314.7461800122.

Adding to 31180380 its reverse (8308113), we get a palindrome (39488493).

The spelling of 31180380 in words is "thirty-one million, one hundred eighty thousand, three hundred eighty".