40185987 has 8 divisors (see below), whose sum is σ = 54721536. Its totient is φ = 26220552.

The previous prime is 40185983. The next prime is 40186001. The reversal of 40185987 is 78958104.

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

It is not a de Polignac number, because 40185987 - 2² = 40185983 is a prime.

It is a super-2 number, since 2×40185987² = 3229827102328338, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (40185983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 142363 + ... + 142644.

It is an arithmetic number, because the mean of its divisors is an integer number (6840192).

Almost surely, 2^40185987 is an apocalyptic number.

40185987 is a gapful number since it is divisible by the number (47) formed by its first and last digit.

40185987 is a deficient number, since it is larger than the sum of its proper divisors (14535549).

40185987 is a wasteful number, since it uses less digits than its factorization.

40185987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285057.

The product of its (nonzero) digits is 80640, while the sum is 42.

The square root of 40185987 is about 6339.2418316389. The cubic root of 40185987 is about 342.5244254163.

The spelling of 40185987 in words is "forty million, one hundred eighty-five thousand, nine hundred eighty-seven".