40204091 has 2 divisors, whose sum is σ = 40204092. Its totient is φ = 40204090.

The previous prime is 40204049. The next prime is 40204103. The reversal of 40204091 is 19040204.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 40204091 - 2⁶ = 40204027 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (40204691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20102045 + 20102046.

It is an arithmetic number, because the mean of its divisors is an integer number (20102046).

Almost surely, 2^40204091 is an apocalyptic number.

40204091 is a deficient number, since it is larger than the sum of its proper divisors (1).

40204091 is an equidigital number, since it uses as much as digits as its factorization.

40204091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 40204091 is about 6340.6696018638. The cubic root of 40204091 is about 342.5758540501.

Adding to 40204091 its reverse (19040204), we get a palindrome (59244295).

The spelling of 40204091 in words is "forty million, two hundred four thousand, ninety-one".