1215982939 has 4 divisors (see below), whose sum is σ = 1244261656. Its totient is φ = 1187704224.

The previous prime is 1215982921. The next prime is 1215982969. The reversal of 1215982939 is 9392895121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1215982939 - 2⁷ = 1215982811 is a prime.

It is a super-2 number, since 2×1215982939² = 2957229015878155442, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1215982892 and 1215982901.

It is not an unprimeable number, because it can be changed into a prime (1215982969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14139294 + ... + 14139379.

It is an arithmetic number, because the mean of its divisors is an integer number (311065414).

Almost surely, 2^1215982939 is an apocalyptic number.

1215982939 is a deficient number, since it is larger than the sum of its proper divisors (28278717).

1215982939 is an equidigital number, since it uses as much as digits as its factorization.

1215982939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28278716.

The product of its digits is 349920, while the sum is 49.

The square root of 1215982939 is about 34870.9469186026. The cubic root of 1215982939 is about 1067.3556676233.

The spelling of 1215982939 in words is "one billion, two hundred fifteen million, nine hundred eighty-two thousand, nine hundred thirty-nine".