13000638 has 16 divisors (see below), whose sum is σ = 29715840. Its totient is φ = 3714456.

The previous prime is 13000633. The next prime is 13000651. The reversal of 13000638 is 83600031.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13000633) 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, 154728 + ... + 154811.

It is an arithmetic number, because the mean of its divisors is an integer number (1857240).

Almost surely, 2^13000638 is an apocalyptic number.

13000638 is an abundant number, since it is smaller than the sum of its proper divisors (16715202).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13000638 is a wasteful number, since it uses less digits than its factorization.

13000638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309551.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 13000638 is about 3605.6397490598. The cubic root of 13000638 is about 235.1373152515.

Adding to 13000638 its reverse (83600031), we get a palindrome (96600669).

The spelling of 13000638 in words is "thirteen million, six hundred thirty-eight", and thus it is an aban number.