42099857 has 4 divisors (see below), whose sum is σ = 42378816. Its totient is φ = 41820900.

The previous prime is 42099847. The next prime is 42099859. The reversal of 42099857 is 75899024.

It is a happy number.

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 42099857 - 2²⁰ = 41051281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42099859) 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, 139253 + ... + 139554.

It is an arithmetic number, because the mean of its divisors is an integer number (10594704).

Almost surely, 2^42099857 is an apocalyptic number.

It is an amenable number.

42099857 is a deficient number, since it is larger than the sum of its proper divisors (278959).

42099857 is a wasteful number, since it uses less digits than its factorization.

42099857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278958.

The product of its (nonzero) digits is 181440, while the sum is 44.

The square root of 42099857 is about 6488.4402594152. The cubic root of 42099857 is about 347.8779270829.

The spelling of 42099857 in words is "forty-two million, ninety-nine thousand, eight hundred fifty-seven".