43240420431 has 48 divisors (see below), whose sum is σ = 73857367584. Its totient is φ = 25044194304.

The previous prime is 43240420429. The next prime is 43240420493. The reversal of 43240420431 is 13402404234.

It is a happy number.

It is not a de Polignac number, because 43240420431 - 2¹ = 43240420429 is a prime.

It is a super-2 number, since 2×43240420431² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 43240420395 and 43240420404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43244420431) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 348886 + ... + 456291.

It is an arithmetic number, because the mean of its divisors is an integer number (1538695158).

Almost surely, 2^43240420431 is an apocalyptic number.

43240420431 is a deficient number, since it is larger than the sum of its proper divisors (30616947153).

43240420431 is a wasteful number, since it uses less digits than its factorization.

43240420431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 805222 (or 805210 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 27.

Adding to 43240420431 its reverse (13402404234), we get a palindrome (56642824665).

The spelling of 43240420431 in words is "forty-three billion, two hundred forty million, four hundred twenty thousand, four hundred thirty-one".