405994778083 has 4 divisors (see below), whose sum is σ = 405999504328. Its totient is φ = 405990051840.

The previous prime is 405994778029. The next prime is 405994778113. The reversal of 405994778083 is 380877499504.

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 405994778083 - 2²¹ = 405992680931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (405994778383) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2231838 + ... + 2406883.

It is an arithmetic number, because the mean of its divisors is an integer number (101499876082).

Almost surely, 2^405994778083 is an apocalyptic number.

405994778083 is a deficient number, since it is larger than the sum of its proper divisors (4726245).

405994778083 is an equidigital number, since it uses as much as digits as its factorization.

405994778083 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4726244.

The product of its (nonzero) digits is 60963840, while the sum is 64.

The spelling of 405994778083 in words is "four hundred five billion, nine hundred ninety-four million, seven hundred seventy-eight thousand, eighty-three".