1222440400 has 60 divisors (see below), whose sum is σ = 2950070112. Its totient is φ = 486785920.

The previous prime is 1222440383. The next prime is 1222440413. The reversal of 1222440400 is 40442221.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 84069 + ... + 97531.

Almost surely, 2^1222440400 is an apocalyptic number.

1222440400 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 1222440400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1475035056).

1222440400 is an abundant number, since it is smaller than the sum of its proper divisors (1727629712).

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

1222440400 is a wasteful number, since it uses less digits than its factorization.

1222440400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13708 (or 13697 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 19.

The square root of 1222440400 is about 34963.4151649978. The cubic root of 1222440400 is about 1069.2417255509.

Adding to 1222440400 its reverse (40442221), we get a palindrome (1262882621).

The spelling of 1222440400 in words is "one billion, two hundred twenty-two million, four hundred forty thousand, four hundred".