40999981 has 8 divisors (see below), whose sum is σ = 44904384. Its totient is φ = 37125120.

The previous prime is 40999969. The next prime is 40999993. The reversal of 40999981 is 18999904.

40999981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (40999969) and next prime (40999993).

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

It is a cyclic number.

It is not a de Polignac number, because 40999981 - 2¹³ = 40991789 is a prime.

It is a super-2 number, since 2×40999981² = 3361996884000722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40999921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4425 + ... + 10078.

It is an arithmetic number, because the mean of its divisors is an integer number (5613048).

Almost surely, 2^40999981 is an apocalyptic number.

It is an amenable number.

40999981 is a deficient number, since it is larger than the sum of its proper divisors (3904403).

40999981 is a wasteful number, since it uses less digits than its factorization.

40999981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14771.

The product of its (nonzero) digits is 209952, while the sum is 49.

The square root of 40999981 is about 6403.1227537819. The cubic root of 40999981 is about 344.8216707731.

The spelling of 40999981 in words is "forty million, nine hundred ninety-nine thousand, nine hundred eighty-one".