400402042 has 8 divisors (see below), whose sum is σ = 600814656. Its totient is φ = 200130492.

The previous prime is 400402033. The next prime is 400402069. The reversal of 400402042 is 240204004.

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, 27858 + ... + 39709.

It is an arithmetic number, because the mean of its divisors is an integer number (75101832).

Almost surely, 2^400402042 is an apocalyptic number.

400402042 is a deficient number, since it is larger than the sum of its proper divisors (200412614).

400402042 is a wasteful number, since it uses less digits than its factorization.

400402042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70532.

The product of its (nonzero) digits is 256, while the sum is 16.

The square root of 400402042 is about 20010.0485256783. The cubic root of 400402042 is about 737.0530729675.

Adding to 400402042 its reverse (240204004), we get a palindrome (640606046).

The spelling of 400402042 in words is "four hundred million, four hundred two thousand, forty-two".