13634387 has 4 divisors (see below), whose sum is σ = 14683200. Its totient is φ = 12585576.

The previous prime is 13634363. The next prime is 13634399. The reversal of 13634387 is 78343631.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78343631 = 19 ⋅4123349.

It is a cyclic number.

It is not a de Polignac number, because 13634387 - 2¹² = 13630291 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13634317) 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, 524387 + ... + 524412.

It is an arithmetic number, because the mean of its divisors is an integer number (3670800).

Almost surely, 2^13634387 is an apocalyptic number.

13634387 is a deficient number, since it is larger than the sum of its proper divisors (1048813).

13634387 is a wasteful number, since it uses less digits than its factorization.

13634387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1048812.

The product of its digits is 36288, while the sum is 35.

The square root of 13634387 is about 3692.4770818517. The cubic root of 13634387 is about 238.8976470398.

The spelling of 13634387 in words is "thirteen million, six hundred thirty-four thousand, three hundred eighty-seven".