13215420 has 48 divisors (see below), whose sum is σ = 41116320. Its totient is φ = 3523968.

The previous prime is 13215383. The next prime is 13215421. The reversal of 13215420 is 2451231.

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

It is a junction number, because it is equal to n+sod(n) for n = 13215393 and 13215402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13215421) 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 15 ways as a sum of consecutive naturals, for example, 11697 + ... + 12776.

It is an arithmetic number, because the mean of its divisors is an integer number (856590).

Almost surely, 2^13215420 is an apocalyptic number.

13215420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13215420 is an abundant number, since it is smaller than the sum of its proper divisors (27900900).

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

13215420 is a wasteful number, since it uses less digits than its factorization.

13215420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24491 (or 24483 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 13215420 is about 3635.3019131841. The cubic root of 13215420 is about 236.4251409784.

Adding to 13215420 its reverse (2451231), we get a palindrome (15666651).

The spelling of 13215420 in words is "thirteen million, two hundred fifteen thousand, four hundred twenty".