42143431 has 4 divisors (see below), whose sum is σ = 45974664. Its totient is φ = 38312200.

The previous prime is 42143417. The next prime is 42143441. The reversal of 42143431 is 13434124.

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

It is a cyclic number.

It is not a de Polignac number, because 42143431 - 2¹¹ = 42141383 is a prime.

It is a super-2 number, since 2×42143431² = 3552137552903522, which contains 22 as substring.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42143401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1915600 + ... + 1915621.

It is an arithmetic number, because the mean of its divisors is an integer number (11493666).

Almost surely, 2^42143431 is an apocalyptic number.

42143431 is a deficient number, since it is larger than the sum of its proper divisors (3831233).

42143431 is a wasteful number, since it uses less digits than its factorization.

42143431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3831232.

The product of its digits is 1152, while the sum is 22.

The square root of 42143431 is about 6491.7972087859. The cubic root of 42143431 is about 347.9979053690.

Adding to 42143431 its reverse (13434124), we get a palindrome (55577555).

The spelling of 42143431 in words is "forty-two million, one hundred forty-three thousand, four hundred thirty-one".