13639780 has 96 divisors (see below), whose sum is σ = 37884672. Its totient is φ = 3993600.

The previous prime is 13639771. The next prime is 13639781. The reversal of 13639780 is 8793631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13639781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25920 + ... + 26440.

It is an arithmetic number, because the mean of its divisors is an integer number (394632).

Almost surely, 2^13639780 is an apocalyptic number.

13639780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13639780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18942336).

13639780 is an abundant number, since it is smaller than the sum of its proper divisors (24244892).

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

13639780 is a wasteful number, since it uses less digits than its factorization.

13639780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 565 (or 563 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 13639780 is about 3693.2072782339. The cubic root of 13639780 is about 238.9291410649.

The spelling of 13639780 in words is "thirteen million, six hundred thirty-nine thousand, seven hundred eighty".