13785231 has 4 divisors (see below), whose sum is σ = 18380312. Its totient is φ = 9190152.

The previous prime is 13785229. The next prime is 13785251. The reversal of 13785231 is 13258731.

13785231 is digitally balanced in base 2, base 3 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 13785231 - 2¹ = 13785229 is a prime.

It is a super-4 number, since 4×13785231⁴ (a number of 30 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13785251) 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, 2297536 + ... + 2297541.

It is an arithmetic number, because the mean of its divisors is an integer number (4595078).

Almost surely, 2^13785231 is an apocalyptic number.

13785231 is a deficient number, since it is larger than the sum of its proper divisors (4595081).

13785231 is an equidigital number, since it uses as much as digits as its factorization.

13785231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4595080.

The product of its digits is 5040, while the sum is 30.

The square root of 13785231 is about 3712.8467514833. The cubic root of 13785231 is about 239.7754322989.

The spelling of 13785231 in words is "thirteen million, seven hundred eighty-five thousand, two hundred thirty-one".