40005998 has 8 divisors (see below), whose sum is σ = 63538992. Its totient is φ = 18826336.

The previous prime is 40005997. The next prime is 40006013. The reversal of 40005998 is 89950004.

40005998 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40005997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 588290 + ... + 588357.

It is an arithmetic number, because the mean of its divisors is an integer number (7942374).

Almost surely, 2^40005998 is an apocalyptic number.

40005998 is a deficient number, since it is larger than the sum of its proper divisors (23532994).

40005998 is a wasteful number, since it uses less digits than its factorization.

40005998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1176666.

The product of its (nonzero) digits is 12960, while the sum is 35.

The square root of 40005998 is about 6325.0294860973. The cubic root of 40005998 is about 342.0122825405.

The spelling of 40005998 in words is "forty million, five thousand, nine hundred ninety-eight".