165438787 has 4 divisors (see below), whose sum is σ = 165472336. Its totient is φ = 165405240.

The previous prime is 165438751. The next prime is 165438817. The reversal of 165438787 is 787834561.

It is a happy number.

165438787 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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-165438787 is a prime.

It is an alternating number because its digits alternate between odd and even.

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 165438787.

It is not an unprimeable number, because it can be changed into a prime (165438727) 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, 7764 + ... + 19777.

It is an arithmetic number, because the mean of its divisors is an integer number (41368084).

Almost surely, 2^165438787 is an apocalyptic number.

165438787 is a deficient number, since it is larger than the sum of its proper divisors (33549).

165438787 is an equidigital number, since it uses as much as digits as its factorization.

165438787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33548.

The product of its digits is 1128960, while the sum is 49.

The square root of 165438787 is about 12862.3009994324. The cubic root of 165438787 is about 548.9664192032.

The spelling of 165438787 in words is "one hundred sixty-five million, four hundred thirty-eight thousand, seven hundred eighty-seven".