40406843 has 2 divisors, whose sum is σ = 40406844. Its totient is φ = 40406842.

The previous prime is 40406833. The next prime is 40406903. The reversal of 40406843 is 34860404.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40406843 is a prime.

It is a super-2 number, since 2×40406843² = 3265425922453298, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (40406803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20203421 + 20203422.

It is an arithmetic number, because the mean of its divisors is an integer number (20203422).

Almost surely, 2^40406843 is an apocalyptic number.

40406843 is a deficient number, since it is larger than the sum of its proper divisors (1).

40406843 is an equidigital number, since it uses as much as digits as its factorization.

40406843 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9216, while the sum is 29.

The square root of 40406843 is about 6356.6377118725. The cubic root of 40406843 is about 343.1507665650.

The spelling of 40406843 in words is "forty million, four hundred six thousand, eight hundred forty-three".