13780261 has 4 divisors (see below), whose sum is σ = 15033024. Its totient is φ = 12527500.

The previous prime is 13780231. The next prime is 13780279. The reversal of 13780261 is 16208731.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 13780261 - 2⁵ = 13780229 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 (13780201) 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, 626365 + ... + 626386.

It is an arithmetic number, because the mean of its divisors is an integer number (3758256).

Almost surely, 2^13780261 is an apocalyptic number.

13780261 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

13780261 is a deficient number, since it is larger than the sum of its proper divisors (1252763).

13780261 is a wasteful number, since it uses less digits than its factorization.

13780261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1252762.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 13780261 is about 3712.1773933906. The cubic root of 13780261 is about 239.7466133612.

Adding to 13780261 its reverse (16208731), we get a palindrome (29988992).

It can be divided in two parts, 13780 and 261, that added together give a palindrome (14041).

The spelling of 13780261 in words is "thirteen million, seven hundred eighty thousand, two hundred sixty-one".