229959987138 has 162 divisors, whose sum is σ = 590824296153. Its totient is φ = 64453656960.

The previous prime is 229959987133. The next prime is 229959987151. The reversal of 229959987138 is 831789959922.

229959987138 is a `hidden beast` number, since 2 + 29 + 9 + 599 + 8 + 7 + 1 + 3 + 8 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 214279187409 + 15680799729 = 462903^2 + 125223^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=339087.

Its product of digits (176359680) is a multiple of the sum of its prime divisors (320).

It is not an unprimeable number, because it can be changed into a prime (229959987133) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 954190698 + ... + 954190938.

Almost surely, 2^229959987138 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 229959987138

229959987138 is an abundant number, since it is smaller than the sum of its proper divisors (360864309015).

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

229959987138 is an equidigital number, since it uses as much as digits as its factorization.

229959987138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 638 (or 320 counting only the distinct ones).

The product of its digits is 176359680, while the sum is 72.

Multiplying 229959987138 by its sum of digits (72), we get a square (16557119073936 = 4069044²).

The spelling of 229959987138 in words is "two hundred twenty-nine billion, nine hundred fifty-nine million, nine hundred eighty-seven thousand, one hundred thirty-eight".