13609890 has 128 divisors (see below), whose sum is σ = 43776000. Its totient is φ = 2939328.

The previous prime is 13609889. The next prime is 13609927. The reversal of 13609890 is 9890631.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 35721 + ... + 36099.

It is an arithmetic number, because the mean of its divisors is an integer number (342000).

Almost surely, 2^13609890 is an apocalyptic number.

13609890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 13609890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21888000).

13609890 is an abundant number, since it is smaller than the sum of its proper divisors (30166110).

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

13609890 is a wasteful number, since it uses less digits than its factorization.

13609890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421 (or 415 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 13609890 is about 3689.1584406203. The cubic root of 13609890 is about 238.7544848988.

The spelling of 13609890 in words is "thirteen million, six hundred nine thousand, eight hundred ninety".