40785981 has 8 divisors (see below), whose sum is σ = 54421344. Its totient is φ = 27170640.

The previous prime is 40785967. The next prime is 40786019. The reversal of 40785981 is 18958704.

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

It is not a de Polignac number, because 40785981 - 2⁶ = 40785917 is a prime.

It is a super-2 number, since 2×40785981² = 3326992492264722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40785911) 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, 670 + ... + 9056.

It is an arithmetic number, because the mean of its divisors is an integer number (6802668).

Almost surely, 2^40785981 is an apocalyptic number.

It is an amenable number.

40785981 is a deficient number, since it is larger than the sum of its proper divisors (13635363).

40785981 is a wasteful number, since it uses less digits than its factorization.

40785981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10011.

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

The square root of 40785981 is about 6386.3902949945. The cubic root of 40785981 is about 344.2206900313.

The spelling of 40785981 in words is "forty million, seven hundred eighty-five thousand, nine hundred eighty-one".