40404020401 has 2 divisors, whose sum is σ = 40404020402. Its totient is φ = 40404020400.

The previous prime is 40404020399. The next prime is 40404020431. The reversal of 40404020401 is 10402040404.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35394778225 + 5009242176 = 188135^2 + 70776^2 .

It is a cyclic number.

It is not a de Polignac number, because 40404020401 - 2¹ = 40404020399 is a prime.

Together with 40404020399, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (40404020431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20202010200 + 20202010201.

It is an arithmetic number, because the mean of its divisors is an integer number (20202010201).

Almost surely, 2^40404020401 is an apocalyptic number.

It is an amenable number.

40404020401 is a deficient number, since it is larger than the sum of its proper divisors (1).

40404020401 is an equidigital number, since it uses as much as digits as its factorization.

40404020401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 512, while the sum is 19.

Adding to 40404020401 its reverse (10402040404), we get a palindrome (50806060805).

The spelling of 40404020401 in words is "forty billion, four hundred four million, twenty thousand, four hundred one".