13438890 has 96 divisors (see below), whose sum is σ = 38188800. Its totient is φ = 3265920.

The previous prime is 13438889. The next prime is 13438913. The reversal of 13438890 is 9883431.

13438890 = T₃₅₆ + T₃₅₇ + ... + T₅₀₀.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 49455 + ... + 49725.

It is an arithmetic number, because the mean of its divisors is an integer number (397800).

Almost surely, 2^13438890 is an apocalyptic number.

13438890 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 13438890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19094400).

13438890 is an abundant number, since it is smaller than the sum of its proper divisors (24749910).

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

13438890 is a wasteful number, since it uses less digits than its factorization.

13438890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332 (or 329 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 13438890 is about 3665.9091641774. The cubic root of 13438890 is about 237.7503325401.

The spelling of 13438890 in words is "thirteen million, four hundred thirty-eight thousand, eight hundred ninety".