402040442 has 8 divisors (see below), whose sum is σ = 607108500. Its totient is φ = 199670944.

The previous prime is 402040439. The next prime is 402040477. The reversal of 402040442 is 244040204.

It can be written as a sum of positive squares in 2 ways, for example, as 392792761 + 9247681 = 19819^2 + 3041^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 674267 + ... + 674862.

Almost surely, 2^402040442 is an apocalyptic number.

402040442 is a deficient number, since it is larger than the sum of its proper divisors (205068058).

402040442 is a wasteful number, since it uses less digits than its factorization.

402040442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1349280.

The product of its (nonzero) digits is 1024, while the sum is 20.

The square root of 402040442 is about 20050.9461622139. The cubic root of 402040442 is about 738.0570175516.

Adding to 402040442 its reverse (244040204), we get a palindrome (646080646).

The spelling of 402040442 in words is "four hundred two million, forty thousand, four hundred forty-two".