405355623 has 4 divisors (see below), whose sum is σ = 540474168. Its totient is φ = 270237080.

The previous prime is 405355619. The next prime is 405355669. The reversal of 405355623 is 326553504.

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 405355623 - 2² = 405355619 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405355603) 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, 67559268 + ... + 67559273.

It is an arithmetic number, because the mean of its divisors is an integer number (135118542).

Almost surely, 2^405355623 is an apocalyptic number.

405355623 is a deficient number, since it is larger than the sum of its proper divisors (135118545).

405355623 is a wasteful number, since it uses less digits than its factorization.

405355623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135118544.

The product of its (nonzero) digits is 54000, while the sum is 33.

The square root of 405355623 is about 20133.4453832423. The cubic root of 405355623 is about 740.0801124614.

The spelling of 405355623 in words is "four hundred five million, three hundred fifty-five thousand, six hundred twenty-three".