400043042 has 16 divisors (see below), whose sum is σ = 686458752. Its totient is φ = 171279360.

The previous prime is 400043011. The next prime is 400043051. The reversal of 400043042 is 240340004.

It is a super-2 number, since 2×400043042² = 320068870905227528, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 400043042.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1442 + ... + 28322.

It is an arithmetic number, because the mean of its divisors is an integer number (42903672).

Almost surely, 2^400043042 is an apocalyptic number.

400043042 is a deficient number, since it is larger than the sum of its proper divisors (286415710).

400043042 is a wasteful number, since it uses less digits than its factorization.

400043042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27953.

The product of its (nonzero) digits is 384, while the sum is 17.

The square root of 400043042 is about 20001.0760210545. The cubic root of 400043042 is about 736.8327267942.

Adding to 400043042 its reverse (240340004), we get a palindrome (640383046).

The spelling of 400043042 in words is "four hundred million, forty-three thousand, forty-two".