13115540 has 24 divisors (see below), whose sum is σ = 28493640. Its totient is φ = 5065088.

The previous prime is 13115537. The next prime is 13115563. The reversal of 13115540 is 4551131.

It can be written as a sum of positive squares in 4 ways, for example, as 1157776 + 11957764 = 1076^2 + 3458^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10727 + ... + 11886.

It is an arithmetic number, because the mean of its divisors is an integer number (1187235).

Almost surely, 2^13115540 is an apocalyptic number.

13115540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13115540 is an abundant number, since it is smaller than the sum of its proper divisors (15378100).

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

13115540 is a wasteful number, since it uses less digits than its factorization.

13115540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22651 (or 22649 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 13115540 is about 3621.5383471669. The cubic root of 13115540 is about 235.8280131597.

Adding to 13115540 its reverse (4551131), we get a palindrome (17666671).

The spelling of 13115540 in words is "thirteen million, one hundred fifteen thousand, five hundred forty".