215399012 has 12 divisors (see below), whose sum is σ = 378863100. Its totient is φ = 107152416.

The previous prime is 215399011. The next prime is 215399017. The reversal of 215399012 is 210993512.

It can be written as a sum of positive squares in 2 ways, for example, as 120648256 + 94750756 = 10984^2 + 9734^2 .

It is a super-2 number, since 2×215399012² = 92793468741152288, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 215399012.

It is not an unprimeable number, because it can be changed into a prime (215399011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 135887 + ... + 137462.

It is an arithmetic number, because the mean of its divisors is an integer number (31571925).

Almost surely, 2^215399012 is an apocalyptic number.

It is an amenable number.

215399012 is a deficient number, since it is larger than the sum of its proper divisors (163464088).

215399012 is a wasteful number, since it uses less digits than its factorization.

215399012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273550 (or 273548 counting only the distinct ones).

The product of its (nonzero) digits is 4860, while the sum is 32.

The square root of 215399012 is about 14676.4781879033. The cubic root of 215399012 is about 599.4430127316.

The spelling of 215399012 in words is "two hundred fifteen million, three hundred ninety-nine thousand, twelve".