11984346405 has 12 divisors (see below), whose sum is σ = 20772867180. Its totient is φ = 6391651392.

The previous prime is 11984346293. The next prime is 11984346421. The reversal of 11984346405 is 50464348911.

It can be written as a sum of positive squares in 2 ways, for example, as 4571652996 + 7412693409 = 67614^2 + 86097^2 .

It is not a de Polignac number, because 11984346405 - 2²² = 11980152101 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 266318809 = 11984346405 / (1 + 1 + 9 + 8 + 4 + 3 + 4 + 6 + 4 + 0 + 5).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 133159360 + ... + 133159449.

It is an arithmetic number, because the mean of its divisors is an integer number (1731072265).

Almost surely, 2^11984346405 is an apocalyptic number.

11984346405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11984346405 is a deficient number, since it is larger than the sum of its proper divisors (8788520775).

11984346405 is a wasteful number, since it uses less digits than its factorization.

11984346405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266318820 (or 266318817 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 45.

The spelling of 11984346405 in words is "eleven billion, nine hundred eighty-four million, three hundred forty-six thousand, four hundred five".