13381605 has 80 divisors (see below), whose sum is σ = 26484480. Its totient is φ = 6438528.

The previous prime is 13381597. The next prime is 13381633. The reversal of 13381605 is 50618331.

It is not a de Polignac number, because 13381605 - 2³ = 13381597 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 284692 + ... + 284738.

It is an arithmetic number, because the mean of its divisors is an integer number (331056).

Almost surely, 2^13381605 is an apocalyptic number.

13381605 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13381605 is a deficient number, since it is larger than the sum of its proper divisors (13102875).

13381605 is a wasteful number, since it uses less digits than its factorization.

13381605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120 (or 111 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 13381605 is about 3658.0876151344. The cubic root of 13381605 is about 237.4120376010.

Adding to 13381605 its reverse (50618331), we get a palindrome (63999936).

The spelling of 13381605 in words is "thirteen million, three hundred eighty-one thousand, six hundred five".