405994999018540 has 96 divisors (see below), whose sum is σ = 863303880418560. Its totient is φ = 160367660057856.

The previous prime is 405994999018529. The next prime is 405994999018547. The reversal of 405994999018540 is 45810999499504.

It is a Smith number, since the sum of its digits (76) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (405994999018547) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 853979739 + ... + 854455021.

It is an arithmetic number, because the mean of its divisors is an integer number (8992748754360).

Almost surely, 2^{405994999018540} is an apocalyptic number.

It is an amenable number.

405994999018540 is an abundant number, since it is smaller than the sum of its proper divisors (457308881400020).

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

405994999018540 is a wasteful number, since it uses less digits than its factorization.

405994999018540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 476671 (or 476669 counting only the distinct ones).

The product of its (nonzero) digits is 755827200, while the sum is 76.

The spelling of 405994999018540 in words is "four hundred five trillion, nine hundred ninety-four billion, nine hundred ninety-nine million, eighteen thousand, five hundred forty".