1215442 has 4 divisors (see below), whose sum is σ = 1823166. Its totient is φ = 607720.

The previous prime is 1215439. The next prime is 1215451. The reversal of 1215442 is 2445121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2445121 = 7 ⋅349303.

It can be written as a sum of positive squares in only one way, i.e., 844561 + 370881 = 919^2 + 609^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 303859 + ... + 303862.

2^1215442 is an apocalyptic number.

1215442 is a deficient number, since it is larger than the sum of its proper divisors (607724).

1215442 is an equidigital number, since it uses as much as digits as its factorization.

1215442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 607723.

The product of its digits is 320, while the sum is 19.

The square root of 1215442 is about 1102.4708612929. The cubic root of 1215442 is about 106.7197370461.

The spelling of 1215442 in words is "one million, two hundred fifteen thousand, four hundred forty-two".