999980215 has 16 divisors (see below), whose sum is σ = 1293562368. Its totient is φ = 737715456.

The previous prime is 999980213. The next prime is 999980231. The reversal of 999980215 is 512089999.

It is a cyclic number.

It is not a de Polignac number, because 999980215 - 2¹ = 999980213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999980213) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63579 + ... + 77731.

It is an arithmetic number, because the mean of its divisors is an integer number (80847648).

Almost surely, 2^999980215 is an apocalyptic number.

999980215 is a deficient number, since it is larger than the sum of its proper divisors (293582153).

999980215 is a wasteful number, since it uses less digits than its factorization.

999980215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15258.

The product of its (nonzero) digits is 524880, while the sum is 52.

The square root of 999980215 is about 31622.4637718189. The cubic root of 999980215 is about 999.9934049565.

The spelling of 999980215 in words is "nine hundred ninety-nine million, nine hundred eighty thousand, two hundred fifteen".