1215983 has 4 divisors (see below), whose sum is σ = 1234200. Its totient is φ = 1197768.

The previous prime is 1215923. The next prime is 1216009. The reversal of 1215983 is 3895121.

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 1215983 - 2⁶ = 1215919 is a prime.

It is a super-2 number, since 2×1215983² = 2957229312578, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9008 + ... + 9141.

It is an arithmetic number, because the mean of its divisors is an integer number (308550).

2^1215983 is an apocalyptic number.

1215983 is a deficient number, since it is larger than the sum of its proper divisors (18217).

1215983 is an equidigital number, since it uses as much as digits as its factorization.

1215983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18216.

The product of its digits is 2160, while the sum is 29.

The square root of 1215983 is about 1102.7161919551. The cubic root of 1215983 is about 106.7355685471.

The spelling of 1215983 in words is "one million, two hundred fifteen thousand, nine hundred eighty-three".