231811799400 has 384 divisors, whose sum is σ = 849200112000. Its totient is φ = 57920901120.

The previous prime is 231811799377. The next prime is 231811799459. The reversal of 231811799400 is 4997118132.

231811799400 is a `hidden beast` number, since 231 + 8 + 1 + 1 + 7 + 9 + 9 + 400 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 21016687 + ... + 21027713.

It is an arithmetic number, because the mean of its divisors is an integer number (2211458625).

Almost surely, 2^231811799400 is an apocalyptic number.

231811799400 is a gapful number since it is divisible by the number (20) 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 231811799400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (424600056000).

231811799400 is an abundant number, since it is smaller than the sum of its proper divisors (617388312600).

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

231811799400 is a wasteful number, since it uses less digits than its factorization.

231811799400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11298 (or 11283 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 45.

The spelling of 231811799400 in words is "two hundred thirty-one billion, eight hundred eleven million, seven hundred ninety-nine thousand, four hundred".