13239481 has 4 divisors (see below), whose sum is σ = 14018292. Its totient is φ = 12460672.

The previous prime is 13239469. The next prime is 13239493. The reversal of 13239481 is 18493231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18493231 = 47 ⋅393473.

It is an interprime number because it is at equal distance from previous prime (13239469) and next prime (13239493).

It can be written as a sum of positive squares in 2 ways, for example, as 9000000 + 4239481 = 3000^2 + 2059^2 .

It is a cyclic number.

It is not a de Polignac number, because 13239481 - 2¹³ = 13231289 is a prime.

It is a super-2 number, since 2×13239481² = 350567714298722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13239461) 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, 389380 + ... + 389413.

It is an arithmetic number, because the mean of its divisors is an integer number (3504573).

Almost surely, 2^13239481 is an apocalyptic number.

It is an amenable number.

13239481 is a deficient number, since it is larger than the sum of its proper divisors (778811).

13239481 is an equidigital number, since it uses as much as digits as its factorization.

13239481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 778810.

The product of its digits is 5184, while the sum is 31.

The square root of 13239481 is about 3638.6097619833. The cubic root of 13239481 is about 236.5685385252.

The spelling of 13239481 in words is "thirteen million, two hundred thirty-nine thousand, four hundred eighty-one".