13220438 has 16 divisors (see below), whose sum is σ = 24724224. Its totient is φ = 5150760.

The previous prime is 13220437. The next prime is 13220461. The reversal of 13220438 is 83402231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13220437) by changing a digit.

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, 42770 + ... + 43077.

It is an arithmetic number, because the mean of its divisors is an integer number (1545264).

Almost surely, 2^13220438 is an apocalyptic number.

13220438 is a deficient number, since it is larger than the sum of its proper divisors (11503786).

13220438 is a wasteful number, since it uses less digits than its factorization.

13220438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85867.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 13220438 is about 3635.9920241937. The cubic root of 13220438 is about 236.4550613601.

Adding to 13220438 its reverse (83402231), we get a palindrome (96622669).

The spelling of 13220438 in words is "thirteen million, two hundred twenty thousand, four hundred thirty-eight".