13401840 has 80 divisors (see below), whose sum is σ = 43747200. Its totient is φ = 3384576.

The previous prime is 13401833. The next prime is 13401841. The reversal of 13401840 is 4810431.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13401841) 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, 3091 + ... + 6029.

It is an arithmetic number, because the mean of its divisors is an integer number (546840).

Almost surely, 2^13401840 is an apocalyptic number.

13401840 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 13401840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21873600).

13401840 is an abundant number, since it is smaller than the sum of its proper divisors (30345360).

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

13401840 is a wasteful number, since it uses less digits than its factorization.

13401840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2974 (or 2968 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 13401840 is about 3660.8523597654. The cubic root of 13401840 is about 237.5316449062.

It can be divided in two parts, 13401 and 840, that added together give a palindrome (14241).

The spelling of 13401840 in words is "thirteen million, four hundred one thousand, eight hundred forty".