215381138 has 8 divisors (see below), whose sum is σ = 369224832. Its totient is φ = 92306196.

The previous prime is 215381129. The next prime is 215381147. The reversal of 215381138 is 831183512.

215381138 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (215381129) and next prime (215381147).

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7692170 + ... + 7692197.

It is an arithmetic number, because the mean of its divisors is an integer number (46153104).

Almost surely, 2^215381138 is an apocalyptic number.

215381138 is a deficient number, since it is larger than the sum of its proper divisors (153843694).

215381138 is a wasteful number, since it uses less digits than its factorization.

215381138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15384376.

The product of its digits is 5760, while the sum is 32.

The square root of 215381138 is about 14675.8692417178. The cubic root of 215381138 is about 599.4264315030.

It can be divided in two parts, 2153811 and 38, that multiplied together give a palindrome (81844818).

The spelling of 215381138 in words is "two hundred fifteen million, three hundred eighty-one thousand, one hundred thirty-eight".