40001121 has 20 divisors (see below), whose sum is σ = 61818900. Its totient is φ = 25746336.

The previous prime is 40001111. The next prime is 40001161. The reversal of 40001121 is 12110004.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 26780625 + 13220496 = 5175^2 + 3636^2 .

It is not a de Polignac number, because 40001121 - 2⁶ = 40001057 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (40001111) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 6166 + ... + 10863.

It is an arithmetic number, because the mean of its divisors is an integer number (3090945).

Almost surely, 2^40001121 is an apocalyptic number.

It is an amenable number.

40001121 is a deficient number, since it is larger than the sum of its proper divisors (21817779).

40001121 is a wasteful number, since it uses less digits than its factorization.

40001121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17070 (or 17061 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 40001121 is about 6324.6439425473. The cubic root of 40001121 is about 341.9983841106.

Adding to 40001121 its reverse (12110004), we get a palindrome (52111125).

The spelling of 40001121 in words is "forty million, one thousand, one hundred twenty-one".