1215000999 has 64 divisors (see below), whose sum is σ = 2023833600. Its totient is φ = 715889664.

The previous prime is 1215000979. The next prime is 1215001001. The reversal of 1215000999 is 9990005121.

It is not a de Polignac number, because 1215000999 - 2¹¹ = 1214998951 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215000979) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1107019 + ... + 1108115.

It is an arithmetic number, because the mean of its divisors is an integer number (31622400).

Almost surely, 2^1215000999 is an apocalyptic number.

1215000999 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

1215000999 is a deficient number, since it is larger than the sum of its proper divisors (808832601).

1215000999 is a wasteful number, since it uses less digits than its factorization.

1215000999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1269 (or 1263 counting only the distinct ones).

The product of its (nonzero) digits is 7290, while the sum is 36.

The square root of 1215000999 is about 34856.8644459022. The cubic root of 1215000999 is about 1067.0682838026.

The spelling of 1215000999 in words is "one billion, two hundred fifteen million, nine hundred ninety-nine", and thus it is an aban number.