1215947 has 4 divisors (see below), whose sum is σ = 1222920. Its totient is φ = 1208976.

The previous prime is 1215923. The next prime is 1216009. The reversal of 1215947 is 7495121.

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 1215947 - 2¹⁰ = 1214923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1215917) 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 in 3 ways as a sum of consecutive naturals, for example, 3218 + ... + 3575.

It is an arithmetic number, because the mean of its divisors is an integer number (305730).

2^1215947 is an apocalyptic number.

1215947 is a deficient number, since it is larger than the sum of its proper divisors (6973).

1215947 is an equidigital number, since it uses as much as digits as its factorization.

1215947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6972.

The product of its digits is 2520, while the sum is 29.

The square root of 1215947 is about 1102.6998685046. The cubic root of 1215947 is about 106.7345152105.

It can be divided in two parts, 121594 and 7, that multiplied together give a palindrome (851158).

The spelling of 1215947 in words is "one million, two hundred fifteen thousand, nine hundred forty-seven".