13978137 has 8 divisors (see below), whose sum is σ = 18763200. Its totient is φ = 9255920.

The previous prime is 13978127. The next prime is 13978147. The reversal of 13978137 is 73187931.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (13978127) and next prime (13978147).

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 13978137 - 2¹⁵ = 13945369 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13978095 and 13978104.

It is not an unprimeable number, because it can be changed into a prime (13978127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15189 + ... + 16082.

It is an arithmetic number, because the mean of its divisors is an integer number (2345400).

Almost surely, 2^13978137 is an apocalyptic number.

It is an amenable number.

13978137 is a deficient number, since it is larger than the sum of its proper divisors (4785063).

13978137 is a wasteful number, since it uses less digits than its factorization.

13978137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31423.

The product of its digits is 31752, while the sum is 39.

The square root of 13978137 is about 3738.7346790057. The cubic root of 13978137 is about 240.8887016715. Note that the first 3 decimals are identical.

The spelling of 13978137 in words is "thirteen million, nine hundred seventy-eight thousand, one hundred thirty-seven".