40517986 has 4 divisors (see below), whose sum is σ = 60776982. Its totient is φ = 20258992.

The previous prime is 40517951. The next prime is 40518007. The reversal of 40517986 is 68971504.

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

It can be written as a sum of positive squares in only one way, i.e., 40513225 + 4761 = 6365^2 + 69^2 .

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 an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10129495 + ... + 10129498.

Almost surely, 2^40517986 is an apocalyptic number.

40517986 is a deficient number, since it is larger than the sum of its proper divisors (20258996).

40517986 is a wasteful number, since it uses less digits than its factorization.

40517986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20258995.

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 40517986 is about 6365.3739874417. The cubic root of 40517986 is about 343.4651018606.

The spelling of 40517986 in words is "forty million, five hundred seventeen thousand, nine hundred eighty-six".