13971730 has 16 divisors (see below), whose sum is σ = 25320600. Its totient is φ = 5550592.

The previous prime is 13971697. The next prime is 13971733. The reversal of 13971730 is 3717931.

It can be written as a sum of positive squares in 4 ways, for example, as 5322249 + 8649481 = 2307^2 + 2941^2 .

It is a junction number, because it is equal to n+sod(n) for n = 13971692 and 13971701.

It is not an unprimeable number, because it can be changed into a prime (13971733) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3199 + ... + 6178.

Almost surely, 2^13971730 is an apocalyptic number.

13971730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

13971730 is a deficient number, since it is larger than the sum of its proper divisors (11348870).

13971730 is a wasteful number, since it uses less digits than its factorization.

13971730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9533.

The product of its (nonzero) digits is 3969, while the sum is 31.

The square root of 13971730 is about 3737.8777401087. The cubic root of 13971730 is about 240.8518915735.

The spelling of 13971730 in words is "thirteen million, nine hundred seventy-one thousand, seven hundred thirty".