40839091 has 2 divisors, whose sum is σ = 40839092. Its totient is φ = 40839090.

The previous prime is 40839089. The next prime is 40839101. The reversal of 40839091 is 19093804.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40839091 - 2¹ = 40839089 is a prime.

Together with 40839089, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (40839031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20419545 + 20419546.

It is an arithmetic number, because the mean of its divisors is an integer number (20419546).

Almost surely, 2^40839091 is an apocalyptic number.

40839091 is a deficient number, since it is larger than the sum of its proper divisors (1).

40839091 is an equidigital number, since it uses as much as digits as its factorization.

40839091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 40839091 is about 6390.5470031915. The cubic root of 40839091 is about 344.3700357210.

The spelling of 40839091 in words is "forty million, eight hundred thirty-nine thousand, ninety-one".