13639065 has 32 divisors (see below), whose sum is σ = 24026112. Its totient is φ = 6552000.

The previous prime is 13639063. The next prime is 13639079. The reversal of 13639065 is 56093631.

It is not a de Polignac number, because 13639065 - 2¹ = 13639063 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13639063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21300 + ... + 21930.

It is an arithmetic number, because the mean of its divisors is an integer number (750816).

Almost surely, 2^13639065 is an apocalyptic number.

13639065 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13639065 is a deficient number, since it is larger than the sum of its proper divisors (10387047).

13639065 is a wasteful number, since it uses less digits than its factorization.

13639065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 781.

The product of its (nonzero) digits is 14580, while the sum is 33.

The square root of 13639065 is about 3693.1104776326. The cubic root of 13639065 is about 238.9249660875.

The spelling of 13639065 in words is "thirteen million, six hundred thirty-nine thousand, sixty-five".