405012242 has 4 divisors (see below), whose sum is σ = 607518366. Its totient is φ = 202506120.

The previous prime is 405012229. The next prime is 405012259. The reversal of 405012242 is 242210504.

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., 403969801 + 1042441 = 20099^2 + 1021^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101253059 + ... + 101253062.

Almost surely, 2^405012242 is an apocalyptic number.

405012242 is a deficient number, since it is larger than the sum of its proper divisors (202506124).

405012242 is a wasteful number, since it uses less digits than its factorization.

405012242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202506123.

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 405012242 is about 20124.9159501350. The cubic root of 405012242 is about 739.8710768828.

Adding to 405012242 its reverse (242210504), we get a palindrome (647222746).

The spelling of 405012242 in words is "four hundred five million, twelve thousand, two hundred forty-two".