1220342340 has 48 divisors (see below), whose sum is σ = 3905096832. Its totient is φ = 278935296.

The previous prime is 1220342339. The next prime is 1220342351. The reversal of 1220342340 is 432430221.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1452369 + ... + 1453208.

It is an arithmetic number, because the mean of its divisors is an integer number (81356184).

Almost surely, 2^1220342340 is an apocalyptic number.

1220342340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220342340 is an abundant number, since it is smaller than the sum of its proper divisors (2684754492).

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

1220342340 is a wasteful number, since it uses less digits than its factorization.

1220342340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2905596 (or 2905594 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 1220342340 is about 34933.3986322545. The cubic root of 1220342340 is about 1068.6296662849.

Adding to 1220342340 its reverse (432430221), we get a palindrome (1652772561).

The spelling of 1220342340 in words is "one billion, two hundred twenty million, three hundred forty-two thousand, three hundred forty".