42916639 has 4 divisors (see below), whose sum is σ = 42933160. Its totient is φ = 42900120.

The previous prime is 42916637. The next prime is 42916663. The reversal of 42916639 is 93661924.

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 42916639 - 2¹ = 42916637 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 (42916631) 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, 3417 + ... + 9874.

It is an arithmetic number, because the mean of its divisors is an integer number (10733290).

Almost surely, 2^42916639 is an apocalyptic number.

42916639 is a deficient number, since it is larger than the sum of its proper divisors (16521).

42916639 is a wasteful number, since it uses less digits than its factorization.

42916639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16520.

The product of its digits is 69984, while the sum is 40.

The square root of 42916639 is about 6551.0792240668. The cubic root of 42916639 is about 350.1132667421.

The spelling of 42916639 in words is "forty-two million, nine hundred sixteen thousand, six hundred thirty-nine".