40817899 has 2 divisors, whose sum is σ = 40817900. Its totient is φ = 40817898.

The previous prime is 40817873. The next prime is 40817951. The reversal of 40817899 is 99871804.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40817899 - 2¹¹ = 40815851 is a prime.

It is a super-2 number, since 2×40817899² = 3332201757548402, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (40817999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20408949 + 20408950.

It is an arithmetic number, because the mean of its divisors is an integer number (20408950).

Almost surely, 2^40817899 is an apocalyptic number.

40817899 is a deficient number, since it is larger than the sum of its proper divisors (1).

40817899 is an equidigital number, since it uses as much as digits as its factorization.

40817899 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145152, while the sum is 46.

The square root of 40817899 is about 6388.8887140097. Note that the first 3 decimals coincide. The cubic root of 40817899 is about 344.3104592033.

The spelling of 40817899 in words is "forty million, eight hundred seventeen thousand, eight hundred ninety-nine".