1240432220 has 12 divisors (see below), whose sum is σ = 2604907704. Its totient is φ = 496172880.

The previous prime is 1240432213. The next prime is 1240432229. The reversal of 1240432220 is 222340421.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 62021611 = 1240432220 / (1 + 2 + 4 + 0 + 4 + 3 + 2 + 2 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 1240432192 and 1240432201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1240432229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31010786 + ... + 31010825.

It is an arithmetic number, because the mean of its divisors is an integer number (217075642).

Almost surely, 2^1240432220 is an apocalyptic number.

1240432220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1240432220 is an abundant number, since it is smaller than the sum of its proper divisors (1364475484).

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

1240432220 is a wasteful number, since it uses less digits than its factorization.

1240432220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62021620 (or 62021618 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 1240432220 is about 35219.7703002163. The cubic root of 1240432220 is about 1074.4618817490.

Adding to 1240432220 its reverse (222340421), we get a palindrome (1462772641).

The spelling of 1240432220 in words is "one billion, two hundred forty million, four hundred thirty-two thousand, two hundred twenty".