13423240 has 32 divisors (see below), whose sum is σ = 30622680. Its totient is φ = 5294592.

The previous prime is 13423231. The next prime is 13423273. The reversal of 13423240 is 4232431.

It can be written as a sum of positive squares in 4 ways, for example, as 8031556 + 5391684 = 2834^2 + 2322^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 622 + ... + 5218.

Almost surely, 2^13423240 is an apocalyptic number.

13423240 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 13423240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15311340).

13423240 is an abundant number, since it is smaller than the sum of its proper divisors (17199440).

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

13423240 is a wasteful number, since it uses less digits than its factorization.

13423240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4681 (or 4677 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 13423240 is about 3663.7740104979. The cubic root of 13423240 is about 237.6580075052.

Adding to 13423240 its reverse (4232431), we get a palindrome (17655671).

The spelling of 13423240 in words is "thirteen million, four hundred twenty-three thousand, two hundred forty".