40812691 has 2 divisors, whose sum is σ = 40812692. Its totient is φ = 40812690.

The previous prime is 40812679. The next prime is 40812727. The reversal of 40812691 is 19621804.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40812691 - 2¹¹ = 40810643 is a prime.

It is a super-2 number, since 2×40812691² = 3331351493322962, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (40812661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20406345 + 20406346.

It is an arithmetic number, because the mean of its divisors is an integer number (20406346).

Almost surely, 2^40812691 is an apocalyptic number.

40812691 is a deficient number, since it is larger than the sum of its proper divisors (1).

40812691 is an equidigital number, since it uses as much as digits as its factorization.

40812691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 40812691 is about 6388.4811183880. The cubic root of 40812691 is about 344.2958149322.

The spelling of 40812691 in words is "forty million, eight hundred twelve thousand, six hundred ninety-one".