40423091 has 2 divisors, whose sum is σ = 40423092. Its totient is φ = 40423090.

The previous prime is 40423087. The next prime is 40423099. The reversal of 40423091 is 19032404.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40423091 - 2² = 40423087 is a prime.

It is not a weakly prime, because it can be changed into another prime (40423099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20211545 + 20211546.

It is an arithmetic number, because the mean of its divisors is an integer number (20211546).

Almost surely, 2^40423091 is an apocalyptic number.

40423091 is a deficient number, since it is larger than the sum of its proper divisors (1).

40423091 is an equidigital number, since it uses as much as digits as its factorization.

40423091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 40423091 is about 6357.9156175589. The cubic root of 40423091 is about 343.1967551987.

Adding to 40423091 its reverse (19032404), we get a palindrome (59455495).

The spelling of 40423091 in words is "forty million, four hundred twenty-three thousand, ninety-one".