1118399400 has 480 divisors, whose sum is σ = 4277940480. Its totient is φ = 269568000.

The previous prime is 1118399371. The next prime is 1118399423. The reversal of 1118399400 is 49938111.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 8537335 + ... + 8537465.

It is an arithmetic number, because the mean of its divisors is an integer number (8912376).

Almost surely, 2^1118399400 is an apocalyptic number.

1118399400 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 1118399400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2138970240).

1118399400 is an abundant number, since it is smaller than the sum of its proper divisors (3159541080).

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

1118399400 is a wasteful number, since it uses less digits than its factorization.

1118399400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207 (or 189 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 36.

The square root of 1118399400 is about 33442.4789750999. The cubic root of 1118399400 is about 1038.0038758250.

The spelling of 1118399400 in words is "one billion, one hundred eighteen million, three hundred ninety-nine thousand, four hundred".