400342 has 4 divisors (see below), whose sum is σ = 600516. Its totient is φ = 200170.

The previous prime is 400339. The next prime is 400381. The reversal of 400342 is 243004.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (13) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100084 + ... + 100087.

It is an arithmetic number, because the mean of its divisors is an integer number (150129).

2⁴⁰⁰³⁴² is an apocalyptic number.

400342 is a deficient number, since it is larger than the sum of its proper divisors (200174).

400342 is a wasteful number, since it uses less digits than its factorization.

400342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200173.

The product of its (nonzero) digits is 96, while the sum is 13.

The square root of 400342 is about 632.7258490057. The cubic root of 400342 is about 73.7016229705.

Adding to 400342 its reverse (243004), we get a palindrome (643346).

The spelling of 400342 in words is "four hundred thousand, three hundred forty-two", and thus it is an iban number.