215400188 has 12 divisors (see below), whose sum is σ = 396789960. Its totient is φ = 102031632.

The previous prime is 215400173. The next prime is 215400191. The reversal of 215400188 is 881004512.

It is a self number, because there is not a number n which added to its sum of digits gives 215400188.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1417031 + ... + 1417182.

It is an arithmetic number, because the mean of its divisors is an integer number (33065830).

Almost surely, 2^215400188 is an apocalyptic number.

It is an amenable number.

215400188 is a deficient number, since it is larger than the sum of its proper divisors (181389772).

215400188 is a wasteful number, since it uses less digits than its factorization.

215400188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2834236 (or 2834234 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 29.

The square root of 215400188 is about 14676.5182519561. The cubic root of 215400188 is about 599.4441036430. Note that the first 3 decimals are identical.

The spelling of 215400188 in words is "two hundred fifteen million, four hundred thousand, one hundred eighty-eight".