13872805 has 4 divisors (see below), whose sum is σ = 16647372. Its totient is φ = 11098240.

The previous prime is 13872797. The next prime is 13872809. The reversal of 13872805 is 50827831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50827831 = 19 ⋅2675149.

It can be written as a sum of positive squares in 2 ways, for example, as 6066369 + 7806436 = 2463^2 + 2794^2 .

It is not a de Polignac number, because 13872805 - 2³ = 13872797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13872809) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1387276 + ... + 1387285.

It is an arithmetic number, because the mean of its divisors is an integer number (4161843).

Almost surely, 2^13872805 is an apocalyptic number.

It is an amenable number.

13872805 is a deficient number, since it is larger than the sum of its proper divisors (2774567).

13872805 is an equidigital number, since it uses as much as digits as its factorization.

13872805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2774566.

The product of its (nonzero) digits is 13440, while the sum is 34.

The square root of 13872805 is about 3724.6214572759. The cubic root of 13872805 is about 240.2821046168.

The spelling of 13872805 in words is "thirteen million, eight hundred seventy-two thousand, eight hundred five".