243401389389 has 12 divisors (see below), whose sum is σ = 352149614076. Its totient is φ = 162004594752.

The previous prime is 243401389337. The next prime is 243401389391. The reversal of 243401389389 is 983983104342.

243401389389 is a `hidden beast` number, since 2 + 4 + 340 + 138 + 93 + 89 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 31302455625 + 212098933764 = 176925^2 + 460542^2 .

It is not a de Polignac number, because 243401389389 - 2²⁸ = 243132953933 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243401389489) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21910654 + ... + 21921759.

It is an arithmetic number, because the mean of its divisors is an integer number (29345801173).

Almost surely, 2^243401389389 is an apocalyptic number.

It is an amenable number.

243401389389 is a deficient number, since it is larger than the sum of its proper divisors (108748224687).

243401389389 is a wasteful number, since it uses less digits than its factorization.

243401389389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43833036 (or 43833033 counting only the distinct ones).

The product of its (nonzero) digits is 4478976, while the sum is 54.

The spelling of 243401389389 in words is "two hundred forty-three billion, four hundred one million, three hundred eighty-nine thousand, three hundred eighty-nine".