40985921 has 4 divisors (see below), whose sum is σ = 41020500. Its totient is φ = 40951344.

The previous prime is 40985909. The next prime is 40985933. The reversal of 40985921 is 12958904.

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

It is an interprime number because it is at equal distance from previous prime (40985909) and next prime (40985933).

It can be written as a sum of positive squares in 2 ways, for example, as 40195600 + 790321 = 6340^2 + 889^2 .

It is a cyclic number.

It is not a de Polignac number, because 40985921 - 2¹⁰ = 40984897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40985951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15446 + ... + 17903.

It is an arithmetic number, because the mean of its divisors is an integer number (10255125).

Almost surely, 2^40985921 is an apocalyptic number.

It is an amenable number.

40985921 is a deficient number, since it is larger than the sum of its proper divisors (34579).

40985921 is a wasteful number, since it uses less digits than its factorization.

40985921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34578.

The product of its (nonzero) digits is 25920, while the sum is 38.

The square root of 40985921 is about 6402.0247578403. The cubic root of 40985921 is about 344.7822500476.

The spelling of 40985921 in words is "forty million, nine hundred eighty-five thousand, nine hundred twenty-one".