13406440 has 16 divisors (see below), whose sum is σ = 30164580. Its totient is φ = 5362560.

The previous prime is 13406429. The next prime is 13406443. The reversal of 13406440 is 4460431.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 13235044 + 171396 = 3638^2 + 414^2 .

It is not an unprimeable number, because it can be changed into a prime (13406443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 167541 + ... + 167620.

Almost surely, 2^13406440 is an apocalyptic number.

13406440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13406440 is an abundant number, since it is smaller than the sum of its proper divisors (16758140).

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

13406440 is a wasteful number, since it uses less digits than its factorization.

13406440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335172 (or 335168 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 13406440 is about 3661.4805748495. The cubic root of 13406440 is about 237.5588183037.

Adding to 13406440 its reverse (4460431), we get a palindrome (17866871).

The spelling of 13406440 in words is "thirteen million, four hundred six thousand, four hundred forty".