215184138 has 16 divisors (see below), whose sum is σ = 463473696. Its totient is φ = 66210480.

The previous prime is 215184133. The next prime is 215184199. The reversal of 215184138 is 831481512.

215184138 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 215184099 and 215184108.

It is not an unprimeable number, because it can be changed into a prime (215184133) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1379308 + ... + 1379463.

It is an arithmetic number, because the mean of its divisors is an integer number (28967106).

Almost surely, 2^215184138 is an apocalyptic number.

215184138 is an abundant number, since it is smaller than the sum of its proper divisors (248289558).

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

215184138 is a wasteful number, since it uses less digits than its factorization.

215184138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2758789.

The product of its digits is 7680, while the sum is 33.

The square root of 215184138 is about 14669.1560084417. The cubic root of 215184138 is about 599.2436191028.

The spelling of 215184138 in words is "two hundred fifteen million, one hundred eighty-four thousand, one hundred thirty-eight".