1218365240 has 32 divisors (see below), whose sum is σ = 2747088000. Its totient is φ = 486321024.

The previous prime is 1218365153. The next prime is 1218365243. The reversal of 1218365240 is 425638121.

It is a junction number, because it is equal to n+sod(n) for n = 1218365197 and 1218365206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1218365243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12635 + ... + 50954.

It is an arithmetic number, because the mean of its divisors is an integer number (85846500).

Almost surely, 2^1218365240 is an apocalyptic number.

1218365240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1218365240 is an abundant number, since it is smaller than the sum of its proper divisors (1528722760).

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

1218365240 is a wasteful number, since it uses less digits than its factorization.

1218365240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64079 (or 64075 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 1218365240 is about 34905.0890272464. The cubic root of 1218365240 is about 1068.0522518820.

The spelling of 1218365240 in words is "one billion, two hundred eighteen million, three hundred sixty-five thousand, two hundred forty".