42839969 has 4 divisors (see below), whose sum is σ = 43997844. Its totient is φ = 41682096.

The previous prime is 42839947. The next prime is 42839981. The reversal of 42839969 is 96993824.

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

It can be written as a sum of positive squares in 2 ways, for example, as 18386944 + 24453025 = 4288^2 + 4945^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42839969 is a prime.

It is a super-2 number, since 2×42839969² = 3670525887841922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42839999) 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, 578882 + ... + 578955.

It is an arithmetic number, because the mean of its divisors is an integer number (10999461).

Almost surely, 2^42839969 is an apocalyptic number.

It is an amenable number.

42839969 is a deficient number, since it is larger than the sum of its proper divisors (1157875).

42839969 is a wasteful number, since it uses less digits than its factorization.

42839969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1157874.

The product of its digits is 839808, while the sum is 50.

The square root of 42839969 is about 6545.2249006432. The cubic root of 42839969 is about 349.9046515782.

The spelling of 42839969 in words is "forty-two million, eight hundred thirty-nine thousand, nine hundred sixty-nine".