405105242 has 4 divisors (see below), whose sum is σ = 607657866. Its totient is φ = 202552620.

The previous prime is 405105199. The next prime is 405105287. The reversal of 405105242 is 242501504.

It is a happy number.

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., 347785201 + 57320041 = 18649^2 + 7571^2 .

It is a super-2 number, since 2×405105242² = 328220514191757128, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101276309 + ... + 101276312.

Almost surely, 2^405105242 is an apocalyptic number.

405105242 is a deficient number, since it is larger than the sum of its proper divisors (202552624).

405105242 is a wasteful number, since it uses less digits than its factorization.

405105242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202552623.

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 405105242 is about 20127.2263861666. The cubic root of 405105242 is about 739.9277029442.

Adding to 405105242 its reverse (242501504), we get a palindrome (647606746).

The spelling of 405105242 in words is "four hundred five million, one hundred five thousand, two hundred forty-two".