402405442 has 8 divisors (see below), whose sum is σ = 608014476. Its totient is φ = 199733952.

The previous prime is 402405413. The next prime is 402405463. The reversal of 402405442 is 244504204.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 400840441 + 1565001 = 20021^2 + 1251^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 734043 + ... + 734590.

Almost surely, 2^402405442 is an apocalyptic number.

402405442 is a deficient number, since it is larger than the sum of its proper divisors (205609034).

402405442 is a wasteful number, since it uses less digits than its factorization.

402405442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1468772.

The product of its (nonzero) digits is 5120, while the sum is 25.

The square root of 402405442 is about 20060.0459122107. The cubic root of 402405442 is about 738.2803029897.

Adding to 402405442 its reverse (244504204), we get a palindrome (646909646).

The spelling of 402405442 in words is "four hundred two million, four hundred five thousand, four hundred forty-two".