42781919 has 4 divisors (see below), whose sum is σ = 42797040. Its totient is φ = 42766800.

The previous prime is 42781889. The next prime is 42781927. The reversal of 42781919 is 91918724.

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 42781919 - 2²⁴ = 26004703 is a prime.

It is a super-2 number, since 2×42781919² = 3660585186645122, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42781019) 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, 1907 + ... + 9444.

It is an arithmetic number, because the mean of its divisors is an integer number (10699260).

Almost surely, 2^42781919 is an apocalyptic number.

42781919 is a deficient number, since it is larger than the sum of its proper divisors (15121).

42781919 is a wasteful number, since it uses less digits than its factorization.

42781919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15120.

The product of its digits is 36288, while the sum is 41.

The square root of 42781919 is about 6540.7888667958. The cubic root of 42781919 is about 349.7465348557.

The spelling of 42781919 in words is "forty-two million, seven hundred eighty-one thousand, nine hundred nineteen".