440400431 has 8 divisors (see below), whose sum is σ = 446929920. Its totient is φ = 433894968.

The previous prime is 440400421. The next prime is 440400461. The reversal of 440400431 is 134004044.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-440400431 is a prime.

It is a super-2 number, since 2×440400431² = 387905079249971522, 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 (440400421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32750 + ... + 44196.

It is an arithmetic number, because the mean of its divisors is an integer number (55866240).

Almost surely, 2^440400431 is an apocalyptic number.

440400431 is a deficient number, since it is larger than the sum of its proper divisors (6529489).

440400431 is a wasteful number, since it uses less digits than its factorization.

440400431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12013.

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 440400431 is about 20985.7196922097. The cubic root of 440400431 is about 760.8211525057.

Adding to 440400431 its reverse (134004044), we get a palindrome (574404475).

The spelling of 440400431 in words is "four hundred forty million, four hundred thousand, four hundred thirty-one".