40243985 has 8 divisors (see below), whose sum is σ = 49320576. Its totient is φ = 31510000.

The previous prime is 40243979. The next prime is 40243991. The reversal of 40243985 is 58934204.

It is an interprime number because it is at equal distance from previous prime (40243979) and next prime (40243991).

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

It is not a de Polignac number, because 40243985 - 2²² = 36049681 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 85391 + ... + 85860.

It is an arithmetic number, because the mean of its divisors is an integer number (6165072).

Almost surely, 2^40243985 is an apocalyptic number.

It is an amenable number.

40243985 is a deficient number, since it is larger than the sum of its proper divisors (9076591).

40243985 is a wasteful number, since it uses less digits than its factorization.

40243985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171303.

The product of its (nonzero) digits is 34560, while the sum is 35.

The square root of 40243985 is about 6343.8147041035. The cubic root of 40243985 is about 342.6891277895.

The spelling of 40243985 in words is "forty million, two hundred forty-three thousand, nine hundred eighty-five".