1222945 has 4 divisors (see below), whose sum is σ = 1467540. Its totient is φ = 978352.

The previous prime is 1222943. The next prime is 1222957. The reversal of 1222945 is 5492221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5492221 = 7 ⋅784603.

It can be written as a sum of positive squares in 2 ways, for example, as 833569 + 389376 = 913^2 + 624^2 .

It is a cyclic number.

It is not a de Polignac number, because 1222945 - 2¹ = 1222943 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1222943) 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, 122290 + ... + 122299.

It is an arithmetic number, because the mean of its divisors is an integer number (366885).

2^1222945 is an apocalyptic number.

It is an amenable number.

1222945 is a deficient number, since it is larger than the sum of its proper divisors (244595).

1222945 is an equidigital number, since it uses as much as digits as its factorization.

1222945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244594.

The product of its digits is 1440, while the sum is 25.

The square root of 1222945 is about 1105.8684370213. The cubic root of 1222945 is about 106.9388826152.

The spelling of 1222945 in words is "one million, two hundred twenty-two thousand, nine hundred forty-five".