1218373 has 16 divisors (see below), whose sum is σ = 1436400. Its totient is φ = 1022976.

The previous prime is 1218367. The next prime is 1218383. The reversal of 1218373 is 3738121.

It can be written as a sum of positive squares in 8 ways, for example, as 1764 + 1216609 = 42^2 + 1103^2 .

It is not a de Polignac number, because 1218373 - 2⁹ = 1217861 is a prime.

It is an Ulam number.

It is a Duffinian number.

1218373 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1218313) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8103 + ... + 8251.

It is an arithmetic number, because the mean of its divisors is an integer number (89775).

2^1218373 is an apocalyptic number.

1218373 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1218373 is a deficient number, since it is larger than the sum of its proper divisors (218027).

1218373 is a wasteful number, since it uses less digits than its factorization.

1218373 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216.

The product of its digits is 1008, while the sum is 25.

The square root of 1218373 is about 1103.7993477077. The cubic root of 1218373 is about 106.8054519420.

The spelling of 1218373 in words is "one million, two hundred eighteen thousand, three hundred seventy-three".