4155689 has 4 divisors (see below), whose sum is σ = 4174224. Its totient is φ = 4137156.

The previous prime is 4155673. The next prime is 4155703. The reversal of 4155689 is 9865514.

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, and also an emirpimes, since its reverse is a distinct semiprime: 9865514 = 2 ⋅4932757.

It is a cyclic number.

It is not a de Polignac number, because 4155689 - 2⁴ = 4155673 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4155629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8927 + ... + 9380.

It is an arithmetic number, because the mean of its divisors is an integer number (1043556).

Almost surely, 2^4155689 is an apocalyptic number.

It is an amenable number.

4155689 is a deficient number, since it is larger than the sum of its proper divisors (18535).

4155689 is a wasteful number, since it uses less digits than its factorization.

4155689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18534.

The product of its digits is 43200, while the sum is 38.

The square root of 4155689 is about 2038.5507106766. The cubic root of 4155689 is about 160.7734555368.

The spelling of 4155689 in words is "four million, one hundred fifty-five thousand, six hundred eighty-nine".