400042 has 8 divisors (see below), whose sum is σ = 604800. Its totient is φ = 198444.

The previous prime is 400033. The next prime is 400051. The reversal of 400042 is 240004.

It is an interprime number because it is at equal distance from previous prime (400033) and next prime (400051).

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 442 + ... + 997.

It is an arithmetic number, because the mean of its divisors is an integer number (75600).

2⁴⁰⁰⁰⁴² is an apocalyptic number.

400042 is a deficient number, since it is larger than the sum of its proper divisors (204758).

400042 is a wasteful number, since it uses less digits than its factorization.

400042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1580.

The product of its (nonzero) digits is 32, while the sum is 10.

The square root of 400042 is about 632.4887350776. The cubic root of 400042 is about 73.6832087046.

Adding to 400042 its reverse (240004), we get a palindrome (640046).

It can be divided in two parts, 40004 and 2, that multiplied together give a palindrome (80008).

The spelling of 400042 in words is "four hundred thousand, forty-two", and thus it is an iban number.