1821274218 has 24 divisors (see below), whose sum is σ = 3985168356. Its totient is φ = 601080000.

The previous prime is 1821274187. The next prime is 1821274249. The reversal of 1821274218 is 8124721281.

It is a happy number.

1821274218 is a `hidden beast` number, since 18 + 212 + 7 + 421 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (1821274187) and next prime (1821274249).

It can be written as a sum of positive squares in 2 ways, for example, as 1726153209 + 95121009 = 41547^2 + 9753^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 499083 + ... + 502718.

Almost surely, 2^1821274218 is an apocalyptic number.

1821274218 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1821274218 is an abundant number, since it is smaller than the sum of its proper divisors (2163894138).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1821274218 is a wasteful number, since it uses less digits than its factorization.

1821274218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1001910 (or 1001907 counting only the distinct ones).

The product of its digits is 14336, while the sum is 36.

The square root of 1821274218 is about 42676.3894677139. The cubic root of 1821274218 is about 1221.2140154931.

Adding to 1821274218 its reverse (8124721281), we get a palindrome (9945995499).

The spelling of 1821274218 in words is "one billion, eight hundred twenty-one million, two hundred seventy-four thousand, two hundred eighteen".