40120001 has 4 divisors (see below), whose sum is σ = 42231600. Its totient is φ = 38008404.

The previous prime is 40119991. The next prime is 40120009. The reversal of 40120001 is 10002104.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40120001 is a prime.

It is a super-2 number, since 2×40120001² = 3219228960480002, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (40120009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1055771 + ... + 1055808.

It is an arithmetic number, because the mean of its divisors is an integer number (10557900).

Almost surely, 2^40120001 is an apocalyptic number.

It is an amenable number.

40120001 is a deficient number, since it is larger than the sum of its proper divisors (2111599).

40120001 is a wasteful number, since it uses less digits than its factorization.

40120001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2111598.

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

The square root of 40120001 is about 6334.0351277839. The cubic root of 40120001 is about 342.3368459426.

Adding to 40120001 its reverse (10002104), we get a palindrome (50122105).

It can be divided in two parts, 401 and 20001, that added together give a palindrome (20402).

The spelling of 40120001 in words is "forty million, one hundred twenty thousand, one".