13385778 has 32 divisors (see below), whose sum is σ = 30948480. Its totient is φ = 3780480.

The previous prime is 13385773. The next prime is 13385809. The reversal of 13385778 is 87758331.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (13385773) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1948 + ... + 5528.

It is an arithmetic number, because the mean of its divisors is an integer number (967140).

Almost surely, 2^13385778 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13385778, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15474240).

13385778 is an abundant number, since it is smaller than the sum of its proper divisors (17562702).

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

13385778 is a wasteful number, since it uses less digits than its factorization.

13385778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3682.

The product of its digits is 141120, while the sum is 42.

The square root of 13385778 is about 3658.6579506699. The cubic root of 13385778 is about 237.4367137009.

The spelling of 13385778 in words is "thirteen million, three hundred eighty-five thousand, seven hundred seventy-eight".