42240431 has 8 divisors (see below), whose sum is σ = 42900480. Its totient is φ = 41583672.

The previous prime is 42240413. The next prime is 42240433. The reversal of 42240431 is 13404224.

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 42240431 - 2¹⁴ = 42224047 is a prime.

It is a super-2 number, since 2×42240431² = 3568508022131522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42240433) 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, 39206 + ... + 40268.

It is an arithmetic number, because the mean of its divisors is an integer number (5362560).

Almost surely, 2^42240431 is an apocalyptic number.

42240431 is a deficient number, since it is larger than the sum of its proper divisors (660049).

42240431 is a wasteful number, since it uses less digits than its factorization.

42240431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1645.

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 42240431 is about 6499.2638813946. The cubic root of 42240431 is about 348.2646921566.

Adding to 42240431 its reverse (13404224), we get a palindrome (55644655).

The spelling of 42240431 in words is "forty-two million, two hundred forty thousand, four hundred thirty-one".