1215897 has 4 divisors (see below), whose sum is σ = 1621200. Its totient is φ = 810596.

The previous prime is 1215881. The next prime is 1215899. The reversal of 1215897 is 7985121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1215897 - 2⁴ = 1215881 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (1215899) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 202647 + ... + 202652.

It is an arithmetic number, because the mean of its divisors is an integer number (405300).

2^1215897 is an apocalyptic number.

It is an amenable number.

1215897 is a deficient number, since it is larger than the sum of its proper divisors (405303).

1215897 is an equidigital number, since it uses as much as digits as its factorization.

1215897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405302.

The product of its digits is 5040, while the sum is 33.

The square root of 1215897 is about 1102.6771966446. The cubic root of 1215897 is about 106.7330522084.

It can be divided in two parts, 1215 and 897, that added together give a palindrome (2112).

The spelling of 1215897 in words is "one million, two hundred fifteen thousand, eight hundred ninety-seven".