1218253490 has 48 divisors (see below), whose sum is σ = 2392603272. Its totient is φ = 446201856.

The previous prime is 1218253481. The next prime is 1218253493. The reversal of 1218253490 is 943528121.

It can be written as a sum of positive squares in 12 ways, for example, as 831226561 + 387026929 = 28831^2 + 19673^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1218253490.

It is not an unprimeable number, because it can be changed into a prime (1218253493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 101234 + ... + 112626.

Almost surely, 2^1218253490 is an apocalyptic number.

1218253490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1218253490 is a deficient number, since it is larger than the sum of its proper divisors (1174349782).

1218253490 is a wasteful number, since it uses less digits than its factorization.

1218253490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11471 (or 11454 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 1218253490 is about 34903.4882210933. The cubic root of 1218253490 is about 1068.0195965161.

The spelling of 1218253490 in words is "one billion, two hundred eighteen million, two hundred fifty-three thousand, four hundred ninety".