1223442440 has 64 divisors (see below), whose sum is σ = 3018764160. Its totient is φ = 442552320.

The previous prime is 1223442377. The next prime is 1223442457. The reversal of 1223442440 is 442443221.

It is a happy number.

It is a super-2 number, since 2×1223442440² = 2993622807986307200, which contains 22 as substring.

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, 77717 + ... + 92123.

It is an arithmetic number, because the mean of its divisors is an integer number (47168190).

Almost surely, 2^1223442440 is an apocalyptic number.

1223442440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1223442440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1509382080).

1223442440 is an abundant number, since it is smaller than the sum of its proper divisors (1795321720).

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

1223442440 is a wasteful number, since it uses less digits than its factorization.

1223442440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14622 (or 14618 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 26.

The square root of 1223442440 is about 34977.7420654907. The cubic root of 1223442440 is about 1069.5337998753.

Adding to 1223442440 its reverse (442443221), we get a palindrome (1665885661).

The spelling of 1223442440 in words is "one billion, two hundred twenty-three million, four hundred forty-two thousand, four hundred forty".