1240312220 has 24 divisors (see below), whose sum is σ = 2976749664. Its totient is φ = 425249856.

The previous prime is 1240312217. The next prime is 1240312273. The reversal of 1240312220 is 222130421.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4429547 + ... + 4429826.

It is an arithmetic number, because the mean of its divisors is an integer number (124031236).

Almost surely, 2^1240312220 is an apocalyptic number.

1240312220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1240312220 is an abundant number, since it is smaller than the sum of its proper divisors (1736437444).

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

1240312220 is a wasteful number, since it uses less digits than its factorization.

1240312220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8859389 (or 8859387 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 1240312220 is about 35218.0666703895. The cubic root of 1240312220 is about 1074.4272326480.

Adding to 1240312220 its reverse (222130421), we get a palindrome (1462442641).

The spelling of 1240312220 in words is "one billion, two hundred forty million, three hundred twelve thousand, two hundred twenty".