215989250 has 32 divisors (see below), whose sum is σ = 428124528. Its totient is φ = 81312000.

The previous prime is 215989229. The next prime is 215989327. The reversal of 215989250 is 52989512.

It can be written as a sum of positive squares in 8 ways, for example, as 80802121 + 135187129 = 8989^2 + 11627^2 .

It is a super-2 number, since 2×215989250² = 93302712231125000, which contains 22 as substring.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 215989198 and 215989207.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21161 + ... + 29660.

Almost surely, 2^215989250 is an apocalyptic number.

215989250 is a deficient number, since it is larger than the sum of its proper divisors (212135278).

215989250 is a wasteful number, since it uses less digits than its factorization.

215989250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50855 (or 50845 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 41.

The square root of 215989250 is about 14696.5727297217. The cubic root of 215989250 is about 599.9900461312.

The spelling of 215989250 in words is "two hundred fifteen million, nine hundred eighty-nine thousand, two hundred fifty".