42806989 has 4 divisors (see below), whose sum is σ = 43717824. Its totient is φ = 41896156.

The previous prime is 42806983. The next prime is 42807029. The reversal of 42806989 is 98960824.

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 42806989 - 2¹⁷ = 42675917 is a prime.

It is a super-2 number, since 2×42806989² = 3664876614492242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42806983) 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, 455347 + ... + 455440.

It is an arithmetic number, because the mean of its divisors is an integer number (10929456).

Almost surely, 2^42806989 is an apocalyptic number.

It is an amenable number.

42806989 is a deficient number, since it is larger than the sum of its proper divisors (910835).

42806989 is an equidigital number, since it uses as much as digits as its factorization.

42806989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 910834.

The product of its (nonzero) digits is 248832, while the sum is 46.

The square root of 42806989 is about 6542.7050216252. The cubic root of 42806989 is about 349.8148381148.

The spelling of 42806989 in words is "forty-two million, eight hundred six thousand, nine hundred eighty-nine".