13509474 has 32 divisors (see below), whose sum is σ = 29859840. Its totient is φ = 4040400.

The previous prime is 13509473. The next prime is 13509479. The reversal of 13509474 is 47490531.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (13509473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3919 + ... + 6509.

It is an arithmetic number, because the mean of its divisors is an integer number (933120).

Almost surely, 2^13509474 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13509474, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14929920).

13509474 is an abundant number, since it is smaller than the sum of its proper divisors (16350366).

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

13509474 is a wasteful number, since it uses less digits than its factorization.

13509474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2686.

The product of its (nonzero) digits is 15120, while the sum is 33.

The square root of 13509474 is about 3675.5236361640. The cubic root of 13509474 is about 238.1658449097.

The spelling of 13509474 in words is "thirteen million, five hundred nine thousand, four hundred seventy-four".