405984454391 has 4 divisors (see below), whose sum is σ = 423635952432. Its totient is φ = 388332956352.

The previous prime is 405984454367. The next prime is 405984454409. The reversal of 405984454391 is 193454489504.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 405984454391 - 2⁶ = 405984454327 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405984451391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8825748986 + ... + 8825749031.

It is an arithmetic number, because the mean of its divisors is an integer number (105908988108).

Almost surely, 2^405984454391 is an apocalyptic number.

405984454391 is a deficient number, since it is larger than the sum of its proper divisors (17651498041).

405984454391 is a wasteful number, since it uses less digits than its factorization.

405984454391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17651498040.

The product of its (nonzero) digits is 12441600, while the sum is 56.

The spelling of 405984454391 in words is "four hundred five billion, nine hundred eighty-four million, four hundred fifty-four thousand, three hundred ninety-one".