1218922 has 4 divisors (see below), whose sum is σ = 1828386. Its totient is φ = 609460.

The previous prime is 1218913. The next prime is 1218923. The reversal of 1218922 is 2298121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2298121 = 7 ⋅328303.

It can be written as a sum of positive squares in only one way, i.e., 755161 + 463761 = 869^2 + 681^2 .

It is not an unprimeable number, because it can be changed into a prime (1218923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 304729 + ... + 304732.

2^1218922 is an apocalyptic number.

1218922 is a deficient number, since it is larger than the sum of its proper divisors (609464).

1218922 is an equidigital number, since it uses as much as digits as its factorization.

1218922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 609463.

The product of its digits is 576, while the sum is 25.

The square root of 1218922 is about 1104.0480062026. The cubic root of 1218922 is about 106.8214917448.

The spelling of 1218922 in words is "one million, two hundred eighteen thousand, nine hundred twenty-two".