405541778 has 4 divisors (see below), whose sum is σ = 608312670. Its totient is φ = 202770888.

The previous prime is 405541693. The next prime is 405541831. The reversal of 405541778 is 877145504.

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

It can be written as a sum of positive squares in only one way, i.e., 401882209 + 3659569 = 20047^2 + 1913^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 101385443 + ... + 101385446.

Almost surely, 2^405541778 is an apocalyptic number.

405541778 is a deficient number, since it is larger than the sum of its proper divisors (202770892).

405541778 is a wasteful number, since it uses less digits than its factorization.

405541778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202770891.

The product of its (nonzero) digits is 156800, while the sum is 41.

The square root of 405541778 is about 20138.0678815024. The cubic root of 405541778 is about 740.1933862726.

The spelling of 405541778 in words is "four hundred five million, five hundred forty-one thousand, seven hundred seventy-eight".