1218722 has 4 divisors (see below), whose sum is σ = 1828086. Its totient is φ = 609360.

The previous prime is 1218709. The next prime is 1218727. The reversal of 1218722 is 2278121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 657721 + 561001 = 811^2 + 749^2 .

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1218727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 304679 + ... + 304682.

2^1218722 is an apocalyptic number.

1218722 is a deficient number, since it is larger than the sum of its proper divisors (609364).

1218722 is an equidigital number, since it uses as much as digits as its factorization.

1218722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 609363.

The product of its digits is 448, while the sum is 23.

The square root of 1218722 is about 1103.9574267154. The cubic root of 1218722 is about 106.8156490229.

The spelling of 1218722 in words is "one million, two hundred eighteen thousand, seven hundred twenty-two".