42143381 has 8 divisors (see below), whose sum is σ = 49147200. Its totient is φ = 36122604.

The previous prime is 42143371. The next prime is 42143389. The reversal of 42143381 is 18334124.

It is not a de Polignac number, because 42143381 - 2⁶ = 42143317 is a prime.

It is a super-2 number, since 2×42143381² = 3552129124222322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42143381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42143389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61091 + ... + 61776.

It is an arithmetic number, because the mean of its divisors is an integer number (6143400).

Almost surely, 2^42143381 is an apocalyptic number.

It is an amenable number.

42143381 is a deficient number, since it is larger than the sum of its proper divisors (7003819).

42143381 is an equidigital number, since it uses as much as digits as its factorization.

42143381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122888 (or 122874 counting only the distinct ones).

The product of its digits is 2304, while the sum is 26.

The square root of 42143381 is about 6491.7933577710. The cubic root of 42143381 is about 347.9977677445.

It can be divided in two parts, 42143 and 381, that added together give a palindrome (42524).

The spelling of 42143381 in words is "forty-two million, one hundred forty-three thousand, three hundred eighty-one".