1210055400 has 144 divisors (see below), whose sum is σ = 4173830700. Its totient is φ = 313943040.

The previous prime is 1210055383. The next prime is 1210055401. The reversal of 1210055400 is 45500121.

1210055400 is a `hidden beast` number, since 1 + 210 + 0 + 55 + 400 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 470976804 + 739078596 = 21702^2 + 27186^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (1210055401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 57516 + ... + 75684.

Almost surely, 2^1210055400 is an apocalyptic number.

1210055400 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 1210055400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2086915350).

1210055400 is an abundant number, since it is smaller than the sum of its proper divisors (2963775300).

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

1210055400 is a wasteful number, since it uses less digits than its factorization.

1210055400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18228 (or 18216 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 1210055400 is about 34785.8505717483. The cubic root of 1210055400 is about 1065.6184994286.

Adding to 1210055400 its reverse (45500121), we get a palindrome (1255555521).

The spelling of 1210055400 in words is "one billion, two hundred ten million, fifty-five thousand, four hundred".