42431445 has 56 divisors (see below), whose sum is σ = 87300096. Its totient is φ = 19385568.

The previous prime is 42431407. The next prime is 42431447. The reversal of 42431445 is 54413424.

It is a happy number.

It is not a de Polignac number, because 42431445 - 2⁷ = 42431317 is a prime.

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

It is a nialpdrome in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42431447) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 24684 + ... + 26346.

Almost surely, 2^42431445 is an apocalyptic number.

42431445 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

42431445 is an abundant number, since it is smaller than the sum of its proper divisors (44868651).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

42431445 is an equidigital number, since it uses as much as digits as its factorization.

42431445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1693 (or 1678 counting only the distinct ones).

The product of its digits is 7680, while the sum is 27.

The square root of 42431445 is about 6513.9423546728. The cubic root of 42431445 is about 348.7888614343.

Adding to 42431445 its reverse (54413424), we get a palindrome (96844869).

The spelling of 42431445 in words is "forty-two million, four hundred thirty-one thousand, four hundred forty-five".