405455242 has 4 divisors (see below), whose sum is σ = 608182866. Its totient is φ = 202727620.

The previous prime is 405455233. The next prime is 405455243. The reversal of 405455242 is 242554504.

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., 220195921 + 185259321 = 14839^2 + 13611^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (405455243) 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 as a sum of consecutive naturals, namely, 101363809 + ... + 101363812.

Almost surely, 2^405455242 is an apocalyptic number.

405455242 is a deficient number, since it is larger than the sum of its proper divisors (202727624).

405455242 is a wasteful number, since it uses less digits than its factorization.

405455242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202727623.

The product of its (nonzero) digits is 32000, while the sum is 31.

The square root of 405455242 is about 20135.9191992817. The cubic root of 405455242 is about 740.1407341293.

The spelling of 405455242 in words is "four hundred five million, four hundred fifty-five thousand, two hundred forty-two".