13422440 has 32 divisors (see below), whose sum is σ = 30701160. Its totient is φ = 5280000.

The previous prime is 13422439. The next prime is 13422463. The reversal of 13422440 is 4422431.

It can be written as a sum of positive squares in 4 ways, for example, as 10982596 + 2439844 = 3314^2 + 1562^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 311 + ... + 5190.

Almost surely, 2^13422440 is an apocalyptic number.

13422440 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 13422440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15350580).

13422440 is an abundant number, since it is smaller than the sum of its proper divisors (17278720).

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

13422440 is a wasteful number, since it uses less digits than its factorization.

13422440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5573 (or 5569 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 13422440 is about 3663.6648318316. The cubic root of 13422440 is about 237.6532860871.

Adding to 13422440 its reverse (4422431), we get a palindrome (17844871).

Subtracting from 13422440 its reverse (4422431), we obtain a palindrome (9000009).

The spelling of 13422440 in words is "thirteen million, four hundred twenty-two thousand, four hundred forty".