38131218 has 48 divisors (see below), whose sum is σ = 84591936. Its totient is φ = 12411360.

The previous prime is 38131211. The next prime is 38131229. The reversal of 38131218 is 81213183.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 38131191 and 38131200.

It is not an unprimeable number, because it can be changed into a prime (38131211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 242796 + ... + 242952.

It is an arithmetic number, because the mean of its divisors is an integer number (1762332).

Almost surely, 2^38131218 is an apocalyptic number.

38131218 is an abundant number, since it is smaller than the sum of its proper divisors (46460718).

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

38131218 is a wasteful number, since it uses less digits than its factorization.

38131218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 399 (or 396 counting only the distinct ones).

The product of its digits is 1152, while the sum is 27.

The square root of 38131218 is about 6175.0480160076. The cubic root of 38131218 is about 336.5840712762.

The spelling of 38131218 in words is "thirty-eight million, one hundred thirty-one thousand, two hundred eighteen".