405779 has 8 divisors (see below), whose sum is σ = 455088. Its totient is φ = 358560.

The previous prime is 405767. The next prime is 405781. The reversal of 405779 is 977504.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 405779 - 2⁴ = 405763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (405709) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 92 + ... + 905.

It is an arithmetic number, because the mean of its divisors is an integer number (56886).

2⁴⁰⁵⁷⁷⁹ is an apocalyptic number.

405779 is a deficient number, since it is larger than the sum of its proper divisors (49309).

405779 is a wasteful number, since it uses less digits than its factorization.

405779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1045.

The product of its (nonzero) digits is 8820, while the sum is 32.

The square root of 405779 is about 637.0078492452. The cubic root of 405779 is about 74.0337683719.

The spelling of 405779 in words is "four hundred five thousand, seven hundred seventy-nine".