43406431 has 4 divisors (see below), whose sum is σ = 45691000. Its totient is φ = 41121864.

The previous prime is 43406399. The next prime is 43406437. The reversal of 43406431 is 13460434.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 43406431 - 2⁵ = 43406399 is a prime.

It is a super-2 number, since 2×43406431² = 3768236504315522, 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 = 43406396 and 43406405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43406437) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1142256 + ... + 1142293.

It is an arithmetic number, because the mean of its divisors is an integer number (11422750).

Almost surely, 2^43406431 is an apocalyptic number.

43406431 is a deficient number, since it is larger than the sum of its proper divisors (2284569).

43406431 is a wasteful number, since it uses less digits than its factorization.

43406431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2284568.

The product of its (nonzero) digits is 3456, while the sum is 25.

The square root of 43406431 is about 6588.3557129226. The cubic root of 43406431 is about 351.4401369227.

Adding to 43406431 its reverse (13460434), we get a palindrome (56866865).

The spelling of 43406431 in words is "forty-three million, four hundred six thousand, four hundred thirty-one".