13409540 has 24 divisors (see below), whose sum is σ = 28922712. Its totient is φ = 5218560.

The previous prime is 13409533. The next prime is 13409551. The reversal of 13409540 is 4590431.

It can be written as a sum of positive squares in 4 ways, for example, as 2768896 + 10640644 = 1664^2 + 3262^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8321 + ... + 9800.

It is an arithmetic number, because the mean of its divisors is an integer number (1205113).

Almost surely, 2^13409540 is an apocalyptic number.

13409540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13409540 is an abundant number, since it is smaller than the sum of its proper divisors (15513172).

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

13409540 is a wasteful number, since it uses less digits than its factorization.

13409540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18167 (or 18165 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 13409540 is about 3661.9038764009. The cubic root of 13409540 is about 237.5771273050.

Adding to 13409540 its reverse (4590431), we get a palindrome (17999971).

The spelling of 13409540 in words is "thirteen million, four hundred nine thousand, five hundred forty".