13042440 has 48 divisors (see below), whose sum is σ = 42389100. Its totient is φ = 3477888.

The previous prime is 13042439. The next prime is 13042441. The reversal of 13042440 is 4424031.

It is an interprime number because it is at equal distance from previous prime (13042439) and next prime (13042441).

It can be written as a sum of positive squares in 2 ways, for example, as 13003236 + 39204 = 3606^2 + 198^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (13042441) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17755 + ... + 18474.

Almost surely, 2^13042440 is an apocalyptic number.

13042440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13042440 is an abundant number, since it is smaller than the sum of its proper divisors (29346660).

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

13042440 is a wasteful number, since it uses less digits than its factorization.

13042440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36246 (or 36239 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 13042440 is about 3611.4318490039. The cubic root of 13042440 is about 235.3890642797.

Adding to 13042440 its reverse (4424031), we get a palindrome (17466471).

The spelling of 13042440 in words is "thirteen million, forty-two thousand, four hundred forty".