40000001 has 4 divisors (see below), whose sum is σ = 40754772. Its totient is φ = 39245232.

The previous prime is 39999983. The next prime is 40000003. The reversal of 40000001 is 10000004.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 35093776 + 4906225 = 5924^2 + 2215^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40000001 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 40000001.

It is not an unprimeable number, because it can be changed into a prime (40000003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 377306 + ... + 377411.

It is an arithmetic number, because the mean of its divisors is an integer number (10188693).

Almost surely, 2^40000001 is an apocalyptic number.

It is an amenable number.

40000001 is a deficient number, since it is larger than the sum of its proper divisors (754771).

40000001 is an equidigital number, since it uses as much as digits as its factorization.

40000001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 754770.

The product of its (nonzero) digits is 4, while the sum is 5.

The square root of 40000001 is about 6324.5553993937. Note that the first 3 decimals coincide. The cubic root of 40000001 is about 341.9951921853.

Adding to 40000001 its reverse (10000004), we get a palindrome (50000005).

The spelling of 40000001 in words is "forty million, one", and thus it is an aban number and an uban number.