42381861 has 4 divisors (see below), whose sum is σ = 56509152. Its totient is φ = 28254572.

The previous prime is 42381853. The next prime is 42381863. The reversal of 42381861 is 16818324.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 42381861 - 2³ = 42381853 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42381863) 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 3 ways as a sum of consecutive naturals, for example, 7063641 + ... + 7063646.

It is an arithmetic number, because the mean of its divisors is an integer number (14127288).

Almost surely, 2^42381861 is an apocalyptic number.

It is an amenable number.

42381861 is a deficient number, since it is larger than the sum of its proper divisors (14127291).

42381861 is a wasteful number, since it uses less digits than its factorization.

42381861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14127290.

The product of its digits is 9216, while the sum is 33.

The square root of 42381861 is about 6510.1352520512. The cubic root of 42381861 is about 348.6529473905.

The spelling of 42381861 in words is "forty-two million, three hundred eighty-one thousand, eight hundred sixty-one".