13811240 has 32 divisors (see below), whose sum is σ = 31185000. Its totient is φ = 5505024.

The previous prime is 13811227. The next prime is 13811243. The reversal of 13811240 is 4211831.

13811240 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 11062276 + 2748964 = 3326^2 + 1658^2 .

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

It is not an unprimeable number, because it can be changed into a prime (13811243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17576 + ... + 18344.

Almost surely, 2^13811240 is an apocalyptic number.

13811240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13811240 is an abundant number, since it is smaller than the sum of its proper divisors (17373760).

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

13811240 is a wasteful number, since it uses less digits than its factorization.

13811240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1229 (or 1225 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 13811240 is about 3716.3476694195. The cubic root of 13811240 is about 239.9261346760.

The spelling of 13811240 in words is "thirteen million, eight hundred eleven thousand, two hundred forty".