13771240 has 64 divisors (see below), whose sum is σ = 35769600. Its totient is φ = 4674048.

The previous prime is 13771229. The next prime is 13771243. The reversal of 13771240 is 4217731.

It is a happy number.

It is a super-2 number, since 2×13771240² = 379294102275200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13771243) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38181 + ... + 38539.

It is an arithmetic number, because the mean of its divisors is an integer number (558900).

Almost surely, 2^13771240 is an apocalyptic number.

13771240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13771240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17884800).

13771240 is an abundant number, since it is smaller than the sum of its proper divisors (21998360).

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

13771240 is a wasteful number, since it uses less digits than its factorization.

13771240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 514 (or 510 counting only the distinct ones).

The product of its (nonzero) digits is 1176, while the sum is 25.

The square root of 13771240 is about 3710.9621393919. The cubic root of 13771240 is about 239.6942866719.

Adding to 13771240 its reverse (4217731), we get a palindrome (17988971).

The spelling of 13771240 in words is "thirteen million, seven hundred seventy-one thousand, two hundred forty".