1215923 has 2 divisors, whose sum is σ = 1215924. Its totient is φ = 1215922.

The previous prime is 1215919. The next prime is 1216009. The reversal of 1215923 is 3295121.

It is a weak prime.

It is an emirp because it is prime and its reverse (3295121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1215923 - 2² = 1215919 is a prime.

It is a super-4 number, since 4×1215923⁴ (a number of 25 digits) contains 4444 as substring.

It is not a weakly prime, because it can be changed into another prime (1215623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 607961 + 607962.

It is an arithmetic number, because the mean of its divisors is an integer number (607962).

2^1215923 is an apocalyptic number.

1215923 is a deficient number, since it is larger than the sum of its proper divisors (1).

1215923 is an equidigital number, since it uses as much as digits as its factorization.

1215923 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 540, while the sum is 23.

The square root of 1215923 is about 1102.6889860700. The cubic root of 1215923 is about 106.7338129745.

The spelling of 1215923 in words is "one million, two hundred fifteen thousand, nine hundred twenty-three".