1212400 has 60 divisors (see below), whose sum is σ = 3336592. Its totient is φ = 414720.

The previous prime is 1212397. The next prime is 1212401. The reversal of 1212400 is 42121.

1212400 = T₁₄₁ + T₁₄₂ + ... + T₂₁₅.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2584 + ... + 3016.

2^1212400 is an apocalyptic number.

1212400 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 1212400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1668296).

1212400 is an abundant number, since it is smaller than the sum of its proper divisors (2124192).

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

1212400 is a wasteful number, since it uses less digits than its factorization.

1212400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 458 (or 447 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 1212400 is about 1101.0903686801. The cubic root of 1212400 is about 106.6306301878.

Adding to 1212400 its reverse (42121), we get a palindrome (1254521).

The spelling of 1212400 in words is "one million, two hundred twelve thousand, four hundred".