243400142736 has 45 divisors (see below), whose sum is σ = 681198912849. Its totient is φ = 81131407488.

The previous prime is 243400142669. The next prime is 243400142743. The reversal of 243400142736 is 637241004342.

The square root of 243400142736 is 493356.

It is a perfect power (a square), and thus also a powerful number.

243400142736 is a `hidden beast` number, since 2 + 43 + 400 + 142 + 73 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 191896563600 + 51503579136 = 438060^2 + 226944^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 243400142736.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 5899716 + ... + 5940828.

Almost surely, 2^243400142736 is an apocalyptic number.

243400142736 is the 493356-th square number.

It is an amenable number.

243400142736 is an abundant number, since it is smaller than the sum of its proper divisors (437798770113).

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

243400142736 is an frugal number, since it uses more digits than its factorization.

243400142736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82240 (or 41118 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 36.

Multiplying 243400142736 by its sum of digits (36), we get a square (8762405138496 = 2960136²).

243400142736 divided by its sum of digits (36) gives a square (6761115076 = 82226²).

The spelling of 243400142736 in words is "two hundred forty-three billion, four hundred million, one hundred forty-two thousand, seven hundred thirty-six".