13997851 has 32 divisors (see below), whose sum is σ = 18385920. Its totient is φ = 10368000.

The previous prime is 13997849. The next prime is 13997861. The reversal of 13997851 is 15879931.

It is a 10-Lehmer number, since φ(13997851) divides (13997851-1)¹⁰.

It is a cyclic number.

It is not a de Polignac number, because 13997851 - 2¹ = 13997849 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13997798 and 13997807.

It is not an unprimeable number, because it can be changed into a prime (13997801) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 92626 + ... + 92776.

It is an arithmetic number, because the mean of its divisors is an integer number (574560).

Almost surely, 2^13997851 is an apocalyptic number.

13997851 is a deficient number, since it is larger than the sum of its proper divisors (4388069).

13997851 is a wasteful number, since it uses less digits than its factorization.

13997851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235.

The product of its digits is 68040, while the sum is 43.

The square root of 13997851 is about 3741.3702035484. The cubic root of 13997851 is about 241.0018938919.

The spelling of 13997851 in words is "thirteen million, nine hundred ninety-seven thousand, eight hundred fifty-one".