42125819 has 4 divisors (see below), whose sum is σ = 43153320. Its totient is φ = 41098320.

The previous prime is 42125789. The next prime is 42125821. The reversal of 42125819 is 91852124.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42125819 is a prime.

It is a super-2 number, since 2×42125819² = 3549169252841522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (42125899) 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, 513689 + ... + 513770.

It is an arithmetic number, because the mean of its divisors is an integer number (10788330).

Almost surely, 2^42125819 is an apocalyptic number.

42125819 is a deficient number, since it is larger than the sum of its proper divisors (1027501).

42125819 is a wasteful number, since it uses less digits than its factorization.

42125819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1027500.

The product of its digits is 5760, while the sum is 32.

The square root of 42125819 is about 6490.4405859695. The cubic root of 42125819 is about 347.9494217901.

The spelling of 42125819 in words is "forty-two million, one hundred twenty-five thousand, eight hundred nineteen".