215039997 has 12 divisors (see below), whose sum is σ = 312176800. Its totient is φ = 142638408.

The previous prime is 215039989. The next prime is 215039999. The reversal of 215039997 is 799930512.

It is a happy number.

It is not a de Polignac number, because 215039997 - 2³ = 215039989 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 (215039999) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 58243 + ... + 61824.

Almost surely, 2^215039997 is an apocalyptic number.

It is an amenable number.

215039997 is a deficient number, since it is larger than the sum of its proper divisors (97136803).

215039997 is a wasteful number, since it uses less digits than its factorization.

215039997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120272 (or 120269 counting only the distinct ones).

The product of its (nonzero) digits is 153090, while the sum is 45.

The square root of 215039997 is about 14664.2421215691. The cubic root of 215039997 is about 599.1097881914.

The spelling of 215039997 in words is "two hundred fifteen million, thirty-nine thousand, nine hundred ninety-seven".