1215913 has 8 divisors (see below), whose sum is σ = 1277696. Its totient is φ = 1155600.

The previous prime is 1215899. The next prime is 1215917. The reversal of 1215913 is 3195121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1215913 - 2⁵ = 1215881 is a prime.

1215913 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1215917) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1570 + ... + 2212.

It is an arithmetic number, because the mean of its divisors is an integer number (159712).

2^1215913 is an apocalyptic number.

It is an amenable number.

1215913 is a deficient number, since it is larger than the sum of its proper divisors (61783).

1215913 is an equidigital number, since it uses as much as digits as its factorization.

1215913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 735.

The product of its digits is 270, while the sum is 22.

The square root of 1215913 is about 1102.6844516905. The cubic root of 1215913 is about 106.7335203734.

The spelling of 1215913 in words is "one million, two hundred fifteen thousand, nine hundred thirteen".