42091799 has 4 divisors (see below), whose sum is σ = 42117264. Its totient is φ = 42066336.

The previous prime is 42091787. The next prime is 42091801. The reversal of 42091799 is 99719024.

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 42091799 - 2¹⁶ = 42026263 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42091729) 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, 10067 + ... + 13620.

It is an arithmetic number, because the mean of its divisors is an integer number (10529316).

Almost surely, 2^42091799 is an apocalyptic number.

42091799 is a deficient number, since it is larger than the sum of its proper divisors (25465).

42091799 is a wasteful number, since it uses less digits than its factorization.

42091799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25464.

The product of its (nonzero) digits is 40824, while the sum is 41.

The square root of 42091799 is about 6487.8192792340. The cubic root of 42091799 is about 347.8557308143.

The spelling of 42091799 in words is "forty-two million, ninety-one thousand, seven hundred ninety-nine".