40127998 has 4 divisors (see below), whose sum is σ = 60192000. Its totient is φ = 20063998.

The previous prime is 40127977. The next prime is 40128001. The reversal of 40127998 is 89972104.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×40127998² = 3220512446976008, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 40127998.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10031998 + ... + 10032001.

It is an arithmetic number, because the mean of its divisors is an integer number (15048000).

Almost surely, 2^40127998 is an apocalyptic number.

40127998 is a deficient number, since it is larger than the sum of its proper divisors (20064002).

40127998 is a wasteful number, since it uses less digits than its factorization.

40127998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20064001.

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 40127998 is about 6334.6663684838. Note that the first 3 decimals coincide. The cubic root of 40127998 is about 342.3595900919.

The spelling of 40127998 in words is "forty million, one hundred twenty-seven thousand, nine hundred ninety-eight".