13151440 has 40 divisors (see below), whose sum is σ = 31569408. Its totient is φ = 5089920.

The previous prime is 13151431. The next prime is 13151443. The reversal of 13151440 is 4415131.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13151443) 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, 172 + ... + 5131.

Almost surely, 2^13151440 is an apocalyptic number.

13151440 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 13151440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15784704).

13151440 is an abundant number, since it is smaller than the sum of its proper divisors (18417968).

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

13151440 is a wasteful number, since it uses less digits than its factorization.

13151440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5347 (or 5341 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 13151440 is about 3626.4914173344. The cubic root of 13151440 is about 236.0429874772.

Adding to 13151440 its reverse (4415131), we get a palindrome (17566571).

The spelling of 13151440 in words is "thirteen million, one hundred fifty-one thousand, four hundred forty".