17428639 has 4 divisors (see below), whose sum is σ = 17438256. Its totient is φ = 17419024.

The previous prime is 17428637. The next prime is 17428667. The reversal of 17428639 is 93682471.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 17428639 - 2¹ = 17428637 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 (17428637) by changing a digit.

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

It is an upside-down number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1174 + ... + 6019.

It is an arithmetic number, because the mean of its divisors is an integer number (4359564).

Almost surely, 2^17428639 is an apocalyptic number.

17428639 is a deficient number, since it is larger than the sum of its proper divisors (9617).

17428639 is an equidigital number, since it uses as much as digits as its factorization.

17428639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9616.

The product of its digits is 72576, while the sum is 40.

The square root of 17428639 is about 4174.7621489134. The cubic root of 17428639 is about 259.2713275907.

The spelling of 17428639 in words is "seventeen million, four hundred twenty-eight thousand, six hundred thirty-nine".