13528639 has 4 divisors (see below), whose sum is σ = 13536760. Its totient is φ = 13520520.

The previous prime is 13528637. The next prime is 13528657. The reversal of 13528639 is 93682531.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 93682531 = 733 ⋅127807.

It is a cyclic number.

It is not a de Polignac number, because 13528639 - 2¹ = 13528637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13528598 and 13528607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13528631) 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, 549 + ... + 5230.

It is an arithmetic number, because the mean of its divisors is an integer number (3384190).

Almost surely, 2^13528639 is an apocalyptic number.

13528639 is a deficient number, since it is larger than the sum of its proper divisors (8121).

13528639 is an equidigital number, since it uses as much as digits as its factorization.

13528639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8120.

The product of its digits is 38880, while the sum is 37.

The square root of 13528639 is about 3678.1298237012. The cubic root of 13528639 is about 238.2784150880.

The spelling of 13528639 in words is "thirteen million, five hundred twenty-eight thousand, six hundred thirty-nine".