404440081 has 16 divisors (see below), whose sum is σ = 440933760. Its totient is φ = 369411840.

The previous prime is 404440067. The next prime is 404440093. The reversal of 404440081 is 180044404.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 404440081 - 2²¹ = 402342929 is a prime.

It is a super-2 number, since 2×404440081² = 327143558238573122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (404440021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 396390 + ... + 397408.

It is an arithmetic number, because the mean of its divisors is an integer number (27558360).

Almost surely, 2^404440081 is an apocalyptic number.

It is an amenable number.

404440081 is a deficient number, since it is larger than the sum of its proper divisors (36493679).

404440081 is a wasteful number, since it uses less digits than its factorization.

404440081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1704.

The product of its (nonzero) digits is 2048, while the sum is 25.

The square root of 404440081 is about 20110.6956866241. The cubic root of 404440081 is about 739.5225072744.

Adding to 404440081 its reverse (180044404), we get a palindrome (584484485).

The spelling of 404440081 in words is "four hundred four million, four hundred forty thousand, eighty-one".