13509890 has 16 divisors (see below), whose sum is σ = 24383160. Its totient is φ = 5389440.

The previous prime is 13509889. The next prime is 13509913. The reversal of 13509890 is 9890531.

It can be written as a sum of positive squares in 4 ways, for example, as 6692569 + 6817321 = 2587^2 + 2611^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 13509890.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2606 + ... + 5814.

Almost surely, 2^13509890 is an apocalyptic number.

13509890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

13509890 is a deficient number, since it is larger than the sum of its proper divisors (10873270).

13509890 is a wasteful number, since it uses less digits than its factorization.

13509890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3637.

The product of its (nonzero) digits is 9720, while the sum is 35.

The square root of 13509890 is about 3675.5802263044. The cubic root of 13509890 is about 238.1682895145.

The spelling of 13509890 in words is "thirteen million, five hundred nine thousand, eight hundred ninety".