243138474738 has 32 divisors (see below), whose sum is σ = 540388238400. Its totient is φ = 81034080768.

The previous prime is 243138474727. The next prime is 243138474743. The reversal of 243138474738 is 837474831342.

243138474738 is a `hidden beast` number, since 2 + 4 + 3 + 138 + 474 + 7 + 38 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33970 + ... + 698162.

It is an arithmetic number, because the mean of its divisors is an integer number (16887132450).

Almost surely, 2^243138474738 is an apocalyptic number.

243138474738 is an abundant number, since it is smaller than the sum of its proper divisors (297249763662).

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

243138474738 is a wasteful number, since it uses less digits than its factorization.

243138474738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 670983 (or 670977 counting only the distinct ones).

The product of its digits is 10838016, while the sum is 54.

The spelling of 243138474738 in words is "two hundred forty-three billion, one hundred thirty-eight million, four hundred seventy-four thousand, seven hundred thirty-eight".