40042121 has 8 divisors (see below), whose sum is σ = 46019520. Its totient is φ = 34129008.

The previous prime is 40042109. The next prime is 40042129. The reversal of 40042121 is 12124004.

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

It is a cyclic number.

It is not a de Polignac number, because 40042121 - 2¹⁰ = 40041097 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40042096 and 40042105.

It is not an unprimeable number, because it can be changed into a prime (40042129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14726 + ... + 17231.

It is an arithmetic number, because the mean of its divisors is an integer number (5752440).

Almost surely, 2^40042121 is an apocalyptic number.

It is an amenable number.

40042121 is a deficient number, since it is larger than the sum of its proper divisors (5977399).

40042121 is a wasteful number, since it uses less digits than its factorization.

40042121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32143.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 40042121 is about 6327.8844015990. The cubic root of 40042121 is about 342.1151903852.

Adding to 40042121 its reverse (12124004), we get a palindrome (52166125).

The spelling of 40042121 in words is "forty million, forty-two thousand, one hundred twenty-one".