42006919 has 4 divisors (see below), whose sum is σ = 43031520. Its totient is φ = 40982320.

The previous prime is 42006911. The next prime is 42006973. The reversal of 42006919 is 91960024.

It is a happy number.

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 42006919 - 2³ = 42006911 is a prime.

It is a super-2 number, since 2×42006919² = 3529162487745122, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) 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 (42006911) 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, 512239 + ... + 512320.

It is an arithmetic number, because the mean of its divisors is an integer number (10757880).

Almost surely, 2^42006919 is an apocalyptic number.

42006919 is a deficient number, since it is larger than the sum of its proper divisors (1024601).

42006919 is a wasteful number, since it uses less digits than its factorization.

42006919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1024600.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 42006919 is about 6481.2744888641. The cubic root of 42006919 is about 347.6217512409.

The spelling of 42006919 in words is "forty-two million, six thousand, nine hundred nineteen".