40017899 has 2 divisors, whose sum is σ = 40017900. Its totient is φ = 40017898.

The previous prime is 40017889. The next prime is 40017947. The reversal of 40017899 is 99871004.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40017899 - 2¹² = 40013803 is a prime.

It is not a weakly prime, because it can be changed into another prime (40017829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20008949 + 20008950.

It is an arithmetic number, because the mean of its divisors is an integer number (20008950).

Almost surely, 2^40017899 is an apocalyptic number.

40017899 is a deficient number, since it is larger than the sum of its proper divisors (1).

40017899 is an equidigital number, since it uses as much as digits as its factorization.

40017899 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 40017899 is about 6325.9702022694. The cubic root of 40017899 is about 342.0461931609.

The spelling of 40017899 in words is "forty million, seventeen thousand, eight hundred ninety-nine".