402400442 has 4 divisors (see below), whose sum is σ = 603600666. Its totient is φ = 201200220.

The previous prime is 402400441. The next prime is 402400499. The reversal of 402400442 is 244004204.

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., 400840441 + 1560001 = 20021^2 + 1249^2 .

It is a super-2 number, since 2×402400442² = 323852231443590728, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (402400441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100600109 + ... + 100600112.

Almost surely, 2^402400442 is an apocalyptic number.

402400442 is a deficient number, since it is larger than the sum of its proper divisors (201200224).

402400442 is a wasteful number, since it uses less digits than its factorization.

402400442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201200223.

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

The square root of 402400442 is about 20059.9212859871. The cubic root of 402400442 is about 738.2772451974.

Adding to 402400442 its reverse (244004204), we get a palindrome (646404646).

The spelling of 402400442 in words is "four hundred two million, four hundred thousand, four hundred forty-two".