1101200400 has 120 divisors (see below), whose sum is σ = 3919496160. Its totient is φ = 293650560.

The previous prime is 1101200389. The next prime is 1101200431. The reversal of 1101200400 is 40021011.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (9).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 40182 + ... + 61781.

It is an arithmetic number, because the mean of its divisors is an integer number (32662468).

Almost surely, 2^1101200400 is an apocalyptic number.

1101200400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1101200400 is an abundant number, since it is smaller than the sum of its proper divisors (2818295760).

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

1101200400 is a wasteful number, since it uses less digits than its factorization.

1101200400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101990 (or 101973 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 1101200400 is about 33184.3396800358. The cubic root of 1101200400 is about 1032.6554786606.

Adding to 1101200400 its reverse (40021011), we get a palindrome (1141221411).

The spelling of 1101200400 in words is "one billion, one hundred one million, two hundred thousand, four hundred".