215199989 has 4 divisors (see below), whose sum is σ = 215239200. Its totient is φ = 215160780.

The previous prime is 215199979. The next prime is 215200019. The reversal of 215199989 is 989991512.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 215199989 - 2⁴ = 215199973 is a prime.

It is a super-2 number, since 2×215199989² = 92622070531200242, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 215199989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215199949) 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, 9707 + ... + 22904.

It is an arithmetic number, because the mean of its divisors is an integer number (53809800).

Almost surely, 2^215199989 is an apocalyptic number.

It is an amenable number.

215199989 is a deficient number, since it is larger than the sum of its proper divisors (39211).

215199989 is an equidigital number, since it uses as much as digits as its factorization.

215199989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39210.

The product of its digits is 524880, while the sum is 53.

The square root of 215199989 is about 14669.6962817912. The cubic root of 215199989 is about 599.2583326678.

The spelling of 215199989 in words is "two hundred fifteen million, one hundred ninety-nine thousand, nine hundred eighty-nine".