13891505 has 16 divisors (see below), whose sum is σ = 17107200. Its totient is φ = 10825920.

The previous prime is 13891483. The next prime is 13891513. The reversal of 13891505 is 50519831.

It is not a de Polignac number, because 13891505 - 2⁸ = 13891249 is a prime.

It is a super-2 number, since 2×13891505² = 385947822330050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38516 + ... + 38874.

It is an arithmetic number, because the mean of its divisors is an integer number (1069200).

Almost surely, 2^13891505 is an apocalyptic number.

It is an amenable number.

13891505 is a deficient number, since it is larger than the sum of its proper divisors (3215695).

13891505 is a wasteful number, since it uses less digits than its factorization.

13891505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 544.

The product of its (nonzero) digits is 5400, while the sum is 32.

The square root of 13891505 is about 3727.1309341100. The cubic root of 13891505 is about 240.3900197776.

The spelling of 13891505 in words is "thirteen million, eight hundred ninety-one thousand, five hundred five".