1121520400 has 240 divisors, whose sum is σ = 3619018368. Its totient is φ = 322560000.

The previous prime is 1121520377. The next prime is 1121520487. The reversal of 1121520400 is 40251211.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 399000 + ... + 401800.

Almost surely, 2^1121520400 is an apocalyptic number.

1121520400 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 1121520400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1809509184).

1121520400 is an abundant number, since it is smaller than the sum of its proper divisors (2497497968).

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

1121520400 is a wasteful number, since it uses less digits than its factorization.

1121520400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2850 (or 2839 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 1121520400 is about 33489.1086772998. The cubic root of 1121520400 is about 1038.9685286075.

Adding to 1121520400 its reverse (40251211), we get a palindrome (1161771611).

The spelling of 1121520400 in words is "one billion, one hundred twenty-one million, five hundred twenty thousand, four hundred".