42040 has 16 divisors (see below), whose sum is σ = 94680. Its totient is φ = 16800.

The previous prime is 42023. The next prime is 42043. The reversal of 42040 is 4024.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42043) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 486 + ... + 565.

2⁴²⁰⁴⁰ is an apocalyptic number.

42040 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

42040 is an abundant number, since it is smaller than the sum of its proper divisors (52640).

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

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47340).

42040 is a wasteful number, since it uses less digits than its factorization.

42040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1062 (or 1058 counting only the distinct ones).

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

The square root of 42040 is about 205.0365821018. The cubic root of 42040 is about 34.7712979528.

Adding to 42040 its reverse (4024), we get a palindrome (46064).

The spelling of 42040 in words is "forty-two thousand, forty", and thus it is an eban number and an iban number.