13971285 has 28 divisors (see below), whose sum is σ = 25143372. Its totient is φ = 7449408.

The previous prime is 13971271. The next prime is 13971299. The reversal of 13971285 is 58217931.

It is an interprime number because it is at equal distance from previous prime (13971271) and next prime (13971299).

It can be written as a sum of positive squares in 2 ways, for example, as 3992004 + 9979281 = 1998^2 + 3159^2 .

It is not a de Polignac number, because 13971285 - 2⁵ = 13971253 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 1729 + ... + 5561.

Almost surely, 2^13971285 is an apocalyptic number.

13971285 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13971285 is a deficient number, since it is larger than the sum of its proper divisors (11172087).

13971285 is an frugal number, since it uses more digits than its factorization.

13971285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3856 (or 3841 counting only the distinct ones).

The product of its digits is 15120, while the sum is 36.

The square root of 13971285 is about 3737.8182138783. The cubic root of 13971285 is about 240.8493344998.

The spelling of 13971285 in words is "thirteen million, nine hundred seventy-one thousand, two hundred eighty-five".