13409890 has 32 divisors (see below), whose sum is σ = 26898480. Its totient is φ = 4779264.

The previous prime is 13409867. The next prime is 13409909. The reversal of 13409890 is 9890431.

13409890 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 1306449 + 12103441 = 1143^2 + 3479^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1992 + ... + 5548.

Almost surely, 2^13409890 is an apocalyptic number.

13409890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

13409890 is an abundant number, since it is smaller than the sum of its proper divisors (13488590).

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

13409890 is a wasteful number, since it uses less digits than its factorization.

13409890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3606.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 13409890 is about 3661.9516654374. The cubic root of 13409890 is about 237.5791942731.

The spelling of 13409890 in words is "thirteen million, four hundred nine thousand, eight hundred ninety".