13809474 has 96 divisors (see below), whose sum is σ = 37920960. Its totient is φ = 3701376.

The previous prime is 13809461. The next prime is 13809479. The reversal of 13809474 is 47490831.

It is a happy number.

13809474 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (13809479) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 44829 + ... + 45135.

It is an arithmetic number, because the mean of its divisors is an integer number (395010).

Almost surely, 2^13809474 is an apocalyptic number.

13809474 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 13809474, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18960480).

13809474 is an abundant number, since it is smaller than the sum of its proper divisors (24111486).

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

13809474 is a wasteful number, since it uses less digits than its factorization.

13809474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 349 (or 336 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 13809474 is about 3716.1100629556. The cubic root of 13809474 is about 239.9159080390.

The spelling of 13809474 in words is "thirteen million, eight hundred nine thousand, four hundred seventy-four".