13641399 has 8 divisors (see below), whose sum is σ = 20209520. Its totient is φ = 9094248.

The previous prime is 13641391. The next prime is 13641413. The reversal of 13641399 is 99314631.

13641399 is a `hidden beast` number, since 1 + 3 + 641 + 3 + 9 + 9 = 666.

13641399 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13641399 - 2³ = 13641391 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 (13641391) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 252592 + ... + 252645.

It is an arithmetic number, because the mean of its divisors is an integer number (2526190).

Almost surely, 2^13641399 is an apocalyptic number.

13641399 is a deficient number, since it is larger than the sum of its proper divisors (6568121).

13641399 is an equidigital number, since it uses as much as digits as its factorization.

13641399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 505246 (or 505240 counting only the distinct ones).

The product of its digits is 17496, while the sum is 36.

The square root of 13641399 is about 3693.4264579114. The cubic root of 13641399 is about 238.9385940760.

The spelling of 13641399 in words is "thirteen million, six hundred forty-one thousand, three hundred ninety-nine".