440438431 has 8 divisors (see below), whose sum is σ = 486622944. Its totient is φ = 396506880.

The previous prime is 440438407. The next prime is 440438447. The reversal of 440438431 is 134834044.

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 440438431 - 2⁷ = 440438303 is a prime.

It is a super-2 number, since 2×440438431² = 387972023003483522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 440438393 and 440438402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (440438231) 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, 562830 + ... + 563611.

It is an arithmetic number, because the mean of its divisors is an integer number (60827868).

Almost surely, 2^440438431 is an apocalyptic number.

440438431 is a deficient number, since it is larger than the sum of its proper divisors (46184513).

440438431 is a wasteful number, since it uses less digits than its factorization.

440438431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1126481.

The product of its (nonzero) digits is 18432, while the sum is 31.

The square root of 440438431 is about 20986.6250502552. The cubic root of 440438431 is about 760.8430343888.

The spelling of 440438431 in words is "four hundred forty million, four hundred thirty-eight thousand, four hundred thirty-one".