43381431 has 24 divisors (see below), whose sum is σ = 65769600. Its totient is φ = 27518400.

The previous prime is 43381421. The next prime is 43381441. The reversal of 43381431 is 13418334.

It is an interprime number because it is at equal distance from previous prime (43381421) and next prime (43381441).

It is not a de Polignac number, because 43381431 - 2⁹ = 43380919 is a prime.

It is a super-2 number, since 2×43381431² = 3763897111215522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 43381395 and 43381404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43381411) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15745 + ... + 18293.

It is an arithmetic number, because the mean of its divisors is an integer number (2740400).

Almost surely, 2^43381431 is an apocalyptic number.

43381431 is a deficient number, since it is larger than the sum of its proper divisors (22388169).

43381431 is a wasteful number, since it uses less digits than its factorization.

43381431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2647 (or 2644 counting only the distinct ones).

The product of its digits is 3456, while the sum is 27.

The square root of 43381431 is about 6586.4581529074. The cubic root of 43381431 is about 351.3726531380.

Adding to 43381431 its reverse (13418334), we get a palindrome (56799765).

The spelling of 43381431 in words is "forty-three million, three hundred eighty-one thousand, four hundred thirty-one".