1391218 has 16 divisors (see below), whose sum is σ = 2269440. Its totient is φ = 637200.

The previous prime is 1391207. The next prime is 1391233. The reversal of 1391218 is 8121931.

It is a junction number, because it is equal to n+sod(n) for n = 1391192 and 1391201.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 588 + ... + 1768.

It is an arithmetic number, because the mean of its divisors is an integer number (141840).

2^1391218 is an apocalyptic number.

1391218 is a deficient number, since it is larger than the sum of its proper divisors (878222).

1391218 is a wasteful number, since it uses less digits than its factorization.

1391218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1233.

The product of its digits is 432, while the sum is 25.

The square root of 1391218 is about 1179.4990462056. The cubic root of 1391218 is about 111.6344908658.

It can be divided in two parts, 139121 and 8, that added together give a square (139129 = 373²).

The spelling of 1391218 in words is "one million, three hundred ninety-one thousand, two hundred eighteen".