1223404400 has 30 divisors (see below), whose sum is σ = 2939230032. Its totient is φ = 489361600.

The previous prime is 1223404397. The next prime is 1223404417. The reversal of 1223404400 is 44043221.

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 5 ways as a sum of consecutive naturals, for example, 1528856 + ... + 1529655.

Almost surely, 2^1223404400 is an apocalyptic number.

1223404400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1223404400 is an abundant number, since it is smaller than the sum of its proper divisors (1715825632).

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

1223404400 is a wasteful number, since it uses less digits than its factorization.

1223404400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3058529 (or 3058518 counting only the distinct ones).

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

The square root of 1223404400 is about 34977.1982868840. The cubic root of 1223404400 is about 1069.5227149001.

Adding to 1223404400 its reverse (44043221), we get a palindrome (1267447621).

The spelling of 1223404400 in words is "one billion, two hundred twenty-three million, four hundred four thousand, four hundred".