440999981 has 4 divisors (see below), whose sum is σ = 441057792. Its totient is φ = 440942172.

The previous prime is 440999971. The next prime is 440999983. The reversal of 440999981 is 189999044.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-440999981 is a prime.

It is a super-2 number, since 2×440999981² = 388961966484000722, 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 (440999983) 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, 15341 + ... + 33426.

It is an arithmetic number, because the mean of its divisors is an integer number (110264448).

Almost surely, 2^440999981 is an apocalyptic number.

It is an amenable number.

440999981 is a deficient number, since it is larger than the sum of its proper divisors (57811).

440999981 is an equidigital number, since it uses as much as digits as its factorization.

440999981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57810.

The product of its (nonzero) digits is 839808, while the sum is 53.

The square root of 440999981 is about 20999.9995476190. Note that the first 3 decimals coincide. The cubic root of 440999981 is about 761.1662501707.

The spelling of 440999981 in words is "four hundred forty million, nine hundred ninety-nine thousand, nine hundred eighty-one".