40142 has 4 divisors (see below), whose sum is σ = 60216. Its totient is φ = 20070.

The previous prime is 40129. The next prime is 40151. The reversal of 40142 is 24104.

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

It is a super-2 number, since 2×40142² = 3222760328, which contains 22 as substring.

It is a plaindrome in base 16.

It is a congruent number.

It is an unprimeable number.

40142 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 as a sum of consecutive naturals, namely, 10034 + ... + 10037.

It is an arithmetic number, because the mean of its divisors is an integer number (15054).

2⁴⁰¹⁴² is an apocalyptic number.

40142 is a deficient number, since it is larger than the sum of its proper divisors (20074).

40142 is a wasteful number, since it uses less digits than its factorization.

40142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20073.

The product of its (nonzero) digits is 32, while the sum is 11.

The square root of 40142 is about 200.3546854955. The cubic root of 40142 is about 34.2399405697.

Adding to 40142 its reverse (24104), we get a palindrome (64246).

The spelling of 40142 in words is "forty thousand, one hundred forty-two", and thus it is an iban number.