42381478 has 4 divisors (see below), whose sum is σ = 63572220. Its totient is φ = 21190738.

The previous prime is 42381461. The next prime is 42381487. The reversal of 42381478 is 87418324.

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

It is a nialpdrome in base 9.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 10595368 + ... + 10595371.

It is an arithmetic number, because the mean of its divisors is an integer number (15893055).

Almost surely, 2^42381478 is an apocalyptic number.

42381478 is a deficient number, since it is larger than the sum of its proper divisors (21190742).

42381478 is a wasteful number, since it uses less digits than its factorization.

42381478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21190741.

The product of its digits is 43008, while the sum is 37.

The square root of 42381478 is about 6510.1058363133. The cubic root of 42381478 is about 348.6518971419.

The spelling of 42381478 in words is "forty-two million, three hundred eighty-one thousand, four hundred seventy-eight".