13787897 has 8 divisors (see below), whose sum is σ = 14146056. Its totient is φ = 13433472.

The previous prime is 13787857. The next prime is 13787899. The reversal of 13787897 is 79878731.

It can be written as a sum of positive squares in 4 ways, for example, as 1263376 + 12524521 = 1124^2 + 3539^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13787897 - 2¹⁰ = 13786873 is a prime.

It is a super-2 number, since 2×13787897² = 380212207365218, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13787899) 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 7 ways as a sum of consecutive naturals, for example, 7493 + ... + 9149.

It is an arithmetic number, because the mean of its divisors is an integer number (1768257).

Almost surely, 2^13787897 is an apocalyptic number.

It is an amenable number.

13787897 is a deficient number, since it is larger than the sum of its proper divisors (358159).

13787897 is a wasteful number, since it uses less digits than its factorization.

13787897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1867.

The product of its digits is 592704, while the sum is 50.

The square root of 13787897 is about 3713.2057578324. The cubic root of 13787897 is about 239.7908884563.

The spelling of 13787897 in words is "thirteen million, seven hundred eighty-seven thousand, eight hundred ninety-seven".