405420577 has 4 divisors (see below), whose sum is σ = 405622420. Its totient is φ = 405218736.

The previous prime is 405420569. The next prime is 405420593. The reversal of 405420577 is 775024504.

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

It can be written as a sum of positive squares in 2 ways, for example, as 404452321 + 968256 = 20111^2 + 984^2 .

It is a cyclic number.

It is not a de Polignac number, because 405420577 - 2³ = 405420569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (405420557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 97878 + ... + 101935.

It is an arithmetic number, because the mean of its divisors is an integer number (101405605).

Almost surely, 2^405420577 is an apocalyptic number.

It is an amenable number.

405420577 is a deficient number, since it is larger than the sum of its proper divisors (201843).

405420577 is a wasteful number, since it uses less digits than its factorization.

405420577 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201842.

The product of its (nonzero) digits is 39200, while the sum is 34.

The square root of 405420577 is about 20135.0584056764. The cubic root of 405420577 is about 740.1196403833.

The spelling of 405420577 in words is "four hundred five million, four hundred twenty thousand, five hundred seventy-seven".