17139945 has 16 divisors (see below), whose sum is σ = 28616832. Its totient is φ = 8743680.

The previous prime is 17139907. The next prime is 17139949. The reversal of 17139945 is 54993171.

It is a happy number.

It is not a de Polignac number, because 17139945 - 2¹⁹ = 16615657 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (17139949) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24496 + ... + 25185.

It is an arithmetic number, because the mean of its divisors is an integer number (1788552).

Almost surely, 2^17139945 is an apocalyptic number.

17139945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

17139945 is a deficient number, since it is larger than the sum of its proper divisors (11476887).

17139945 is a wasteful number, since it uses less digits than its factorization.

17139945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49712.

The product of its digits is 34020, while the sum is 39.

The square root of 17139945 is about 4140.0416664570. The cubic root of 17139945 is about 257.8317964987.

The spelling of 17139945 in words is "seventeen million, one hundred thirty-nine thousand, nine hundred forty-five".