42240344431 has 4 divisors (see below), whose sum is σ = 44725070592. Its totient is φ = 39755618272.

The previous prime is 42240344369. The next prime is 42240344483. The reversal of 42240344431 is 13444304224.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42240344431 is a prime.

It is a super-2 number, since 2×42240344431² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42240344393 and 42240344402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42240344131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1242363055 + ... + 1242363088.

It is an arithmetic number, because the mean of its divisors is an integer number (11181267648).

Almost surely, 2^42240344431 is an apocalyptic number.

42240344431 is a deficient number, since it is larger than the sum of its proper divisors (2484726161).

42240344431 is a wasteful number, since it uses less digits than its factorization.

42240344431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2484726160.

The product of its (nonzero) digits is 36864, while the sum is 31.

Adding to 42240344431 its reverse (13444304224), we get a palindrome (55684648655).

The spelling of 42240344431 in words is "forty-two billion, two hundred forty million, three hundred forty-four thousand, four hundred thirty-one".