40840121 has 8 divisors (see below), whose sum is σ = 47088384. Its totient is φ = 34695360.

The previous prime is 40840117. The next prime is 40840159. The reversal of 40840121 is 12104804.

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

It is not a de Polignac number, because 40840121 - 2² = 40840117 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 40840093 and 40840102.

It is not an unprimeable number, because it can be changed into a prime (40840181) 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, 25025 + ... + 26606.

It is an arithmetic number, because the mean of its divisors is an integer number (5886048).

Almost surely, 2^40840121 is an apocalyptic number.

It is an amenable number.

40840121 is a deficient number, since it is larger than the sum of its proper divisors (6248263).

40840121 is a wasteful number, since it uses less digits than its factorization.

40840121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51751.

The product of its (nonzero) digits is 256, while the sum is 20.

The square root of 40840121 is about 6390.6275904640. The cubic root of 40840121 is about 344.3729308080.

Adding to 40840121 its reverse (12104804), we get a palindrome (52944925).

The spelling of 40840121 in words is "forty million, eight hundred forty thousand, one hundred twenty-one".