1218707240 has 48 divisors (see below), whose sum is σ = 2765315700. Its totient is φ = 483388416.

The previous prime is 1218707239. The next prime is 1218707249. The reversal of 1218707240 is 427078121.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1210900804 + 7806436 = 34798^2 + 2794^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1218707197 and 1218707206.

It is not an unprimeable number, because it can be changed into a prime (1218707249) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 644216 + ... + 646104.

Almost surely, 2^1218707240 is an apocalyptic number.

1218707240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1218707240 is an abundant number, since it is smaller than the sum of its proper divisors (1546608460).

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

1218707240 is a wasteful number, since it uses less digits than its factorization.

1218707240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2154 (or 2023 counting only the distinct ones).

The product of its (nonzero) digits is 6272, while the sum is 32.

The square root of 1218707240 is about 34909.9876826103. The cubic root of 1218707240 is about 1068.1521780469.

The spelling of 1218707240 in words is "one billion, two hundred eighteen million, seven hundred seven thousand, two hundred forty".