40409401 has 2 divisors, whose sum is σ = 40409402. Its totient is φ = 40409400.

The previous prime is 40409387. The next prime is 40409443. The reversal of 40409401 is 10490404.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32764176 + 7645225 = 5724^2 + 2765^2 .

It is a cyclic number.

It is not a de Polignac number, because 40409401 - 2⁷ = 40409273 is a prime.

It is not a weakly prime, because it can be changed into another prime (40409101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20204700 + 20204701.

It is an arithmetic number, because the mean of its divisors is an integer number (20204701).

Almost surely, 2^40409401 is an apocalyptic number.

It is an amenable number.

40409401 is a deficient number, since it is larger than the sum of its proper divisors (1).

40409401 is an equidigital number, since it uses as much as digits as its factorization.

40409401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 40409401 is about 6356.8389156876. The cubic root of 40409401 is about 343.1580075922.

Adding to 40409401 its reverse (10490404), we get a palindrome (50899805).

The spelling of 40409401 in words is "forty million, four hundred nine thousand, four hundred one".