440412231 has 32 divisors (see below), whose sum is σ = 688619520. Its totient is φ = 245147616.

The previous prime is 440412227. The next prime is 440412311. The reversal of 440412231 is 132214044.

It is not a de Polignac number, because 440412231 - 2² = 440412227 is a prime.

It is a super-2 number, since 2×440412231² = 387925866428794722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 440412198 and 440412207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (440412031) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 234960 + ... + 236826.

It is an arithmetic number, because the mean of its divisors is an integer number (21519360).

Almost surely, 2^440412231 is an apocalyptic number.

440412231 is a deficient number, since it is larger than the sum of its proper divisors (248207289).

440412231 is a wasteful number, since it uses less digits than its factorization.

440412231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2163.

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 440412231 is about 20986.0008338892. Note that the first 3 decimals coincide. The cubic root of 440412231 is about 760.8279475410.

Adding to 440412231 its reverse (132214044), we get a palindrome (572626275).

The spelling of 440412231 in words is "four hundred forty million, four hundred twelve thousand, two hundred thirty-one".