1212504400 has 60 divisors (see below), whose sum is σ = 2919779392. Its totient is φ = 483880320.

The previous prime is 1212504329. The next prime is 1212504401. The reversal of 1212504400 is 44052121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212504401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 181927 + ... + 188473.

Almost surely, 2^1212504400 is an apocalyptic number.

1212504400 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 1212504400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1459889696).

1212504400 is an abundant number, since it is smaller than the sum of its proper divisors (1707274992).

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

1212504400 is a wasteful number, since it uses less digits than its factorization.

1212504400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7028 (or 7017 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 1212504400 is about 34821.0338732209. The cubic root of 1212504400 is about 1066.3369076144.

Adding to 1212504400 its reverse (44052121), we get a palindrome (1256556521).

The spelling of 1212504400 in words is "one billion, two hundred twelve million, five hundred four thousand, four hundred".