400042444402 has 4 divisors (see below), whose sum is σ = 600063666606. Its totient is φ = 200021222200.

The previous prime is 400042444391. The next prime is 400042444433. The reversal of 400042444402 is 204444240004.

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., 351849462561 + 48192981841 = 593169^2 + 219529^2 .

It is a super-2 number, since 2×400042444402² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100010611099 + ... + 100010611102.

Almost surely, 2^400042444402 is an apocalyptic number.

400042444402 is a deficient number, since it is larger than the sum of its proper divisors (200021222204).

400042444402 is a wasteful number, since it uses less digits than its factorization.

400042444402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200021222203.

The product of its (nonzero) digits is 16384, while the sum is 28.

Adding to 400042444402 its reverse (204444240004), we get a palindrome (604486684406).

The spelling of 400042444402 in words is "four hundred billion, forty-two million, four hundred forty-four thousand, four hundred two".