400242 has 16 divisors (see below), whose sum is σ = 820512. Its totient is φ = 130080.

The previous prime is 400237. The next prime is 400243. The reversal of 400242 is 242004.

It is not an unprimeable number, because it can be changed into a prime (400243) by changing a digit.

400242 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 568 + ... + 1059.

It is an arithmetic number, because the mean of its divisors is an integer number (51282).

2⁴⁰⁰²⁴² is an apocalyptic number.

400242 is an abundant number, since it is smaller than the sum of its proper divisors (420270).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

400242 is a wasteful number, since it uses less digits than its factorization.

400242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1673.

The product of its (nonzero) digits is 64, while the sum is 12.

The square root of 400242 is about 632.6468209040. The cubic root of 400242 is about 73.6954859043.

Adding to 400242 its reverse (242004), we get a palindrome (642246).

The spelling of 400242 in words is "four hundred thousand, two hundred forty-two", and thus it is an iban number.