40812121 has 16 divisors (see below), whose sum is σ = 50443776. Its totient is φ = 32219136.

The previous prime is 40812119. The next prime is 40812127. The reversal of 40812121 is 12121804.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 40812121 - 2¹ = 40812119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40812127) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1945 + ... + 9241.

It is an arithmetic number, because the mean of its divisors is an integer number (3152736).

Almost surely, 2^40812121 is an apocalyptic number.

It is an amenable number.

40812121 is a deficient number, since it is larger than the sum of its proper divisors (9631655).

40812121 is a wasteful number, since it uses less digits than its factorization.

40812121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7368.

The product of its (nonzero) digits is 128, while the sum is 19.

The square root of 40812121 is about 6388.4365066893. The cubic root of 40812121 is about 344.2942120849.

Adding to 40812121 its reverse (12121804), we get a palindrome (52933925).

The spelling of 40812121 in words is "forty million, eight hundred twelve thousand, one hundred twenty-one".