1220224340 has 24 divisors (see below), whose sum is σ = 2616993792. Its totient is φ = 477704480.

The previous prime is 1220224337. The next prime is 1220224393. The reversal of 1220224340 is 434220221.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 648116 + ... + 649995.

It is an arithmetic number, because the mean of its divisors is an integer number (109041408).

Almost surely, 2^1220224340 is an apocalyptic number.

1220224340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220224340 is an abundant number, since it is smaller than the sum of its proper divisors (1396769452).

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

1220224340 is a wasteful number, since it uses less digits than its factorization.

1220224340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1298167 (or 1298165 counting only the distinct ones).

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

The square root of 1220224340 is about 34931.7096632844. The cubic root of 1220224340 is about 1068.5952217521.

Adding to 1220224340 its reverse (434220221), we get a palindrome (1654444561).

The spelling of 1220224340 in words is "one billion, two hundred twenty million, two hundred twenty-four thousand, three hundred forty".