13899561 has 8 divisors (see below), whose sum is σ = 19958400. Its totient is φ = 8553552.

The previous prime is 13899559. The next prime is 13899569. The reversal of 13899561 is 16599831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 13899561 - 2¹ = 13899559 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (13899569) 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 7 ways as a sum of consecutive naturals, for example, 178161 + ... + 178238.

It is an arithmetic number, because the mean of its divisors is an integer number (2494800).

Almost surely, 2^13899561 is an apocalyptic number.

It is an amenable number.

13899561 is a deficient number, since it is larger than the sum of its proper divisors (6058839).

13899561 is a wasteful number, since it uses less digits than its factorization.

13899561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 356415.

The product of its digits is 58320, while the sum is 42.

The square root of 13899561 is about 3728.2115015111. The cubic root of 13899561 is about 240.4364800127.

It can be divided in two parts, 138 and 99561, that added together give a palindrome (99699).

The spelling of 13899561 in words is "thirteen million, eight hundred ninety-nine thousand, five hundred sixty-one".