400042430 has 8 divisors (see below), whose sum is σ = 720076392. Its totient is φ = 160016968.

The previous prime is 400042369. The next prime is 400042441. The reversal of 400042430 is 34240004.

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

It is a junction number, because it is equal to n+sod(n) for n = 400042399 and 400042408.

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 20002112 + ... + 20002131.

It is an arithmetic number, because the mean of its divisors is an integer number (90009549).

Almost surely, 2^400042430 is an apocalyptic number.

400042430 is a deficient number, since it is larger than the sum of its proper divisors (320033962).

400042430 is a wasteful number, since it uses less digits than its factorization.

400042430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40004250.

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

The square root of 400042430 is about 20001.0607218717. The cubic root of 400042430 is about 736.8323510497.

Adding to 400042430 its reverse (34240004), we get a palindrome (434282434).

The spelling of 400042430 in words is "four hundred million, forty-two thousand, four hundred thirty".