42438511 has 4 divisors (see below), whose sum is σ = 44934912. Its totient is φ = 39942112.

The previous prime is 42438497. The next prime is 42438559. The reversal of 42438511 is 11583424.

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

It is not a de Polignac number, because 42438511 - 2⁵ = 42438479 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42438511.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42438581) 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, 1248175 + ... + 1248208.

It is an arithmetic number, because the mean of its divisors is an integer number (11233728).

Almost surely, 2^42438511 is an apocalyptic number.

42438511 is a deficient number, since it is larger than the sum of its proper divisors (2496401).

42438511 is a wasteful number, since it uses less digits than its factorization.

42438511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2496400.

The product of its digits is 3840, while the sum is 28.

The square root of 42438511 is about 6514.4847071737. The cubic root of 42438511 is about 348.8082213320.

The spelling of 42438511 in words is "forty-two million, four hundred thirty-eight thousand, five hundred eleven".