1215673 has 2 divisors, whose sum is σ = 1215674. Its totient is φ = 1215672.

The previous prime is 1215649. The next prime is 1215679. The reversal of 1215673 is 3765121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 898704 + 316969 = 948^2 + 563^2 .

It is a cyclic number.

It is not a de Polignac number, because 1215673 - 2⁹ = 1215161 is a prime.

It is an Ulam number.

1215673 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (1215679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 607836 + 607837.

It is an arithmetic number, because the mean of its divisors is an integer number (607837).

2^1215673 is an apocalyptic number.

It is an amenable number.

1215673 is a deficient number, since it is larger than the sum of its proper divisors (1).

1215673 is an equidigital number, since it uses as much as digits as its factorization.

1215673 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1260, while the sum is 25.

The square root of 1215673 is about 1102.5756209893. The cubic root of 1215673 is about 106.7264974668.

The spelling of 1215673 in words is "one million, two hundred fifteen thousand, six hundred seventy-three".