13987819 has 8 divisors (see below), whose sum is σ = 14912000. Its totient is φ = 13082472.

The previous prime is 13987807. The next prime is 13987843. The reversal of 13987819 is 91878931.

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 13987819 - 2¹⁷ = 13856747 is a prime.

It is a super-2 number, since 2×13987819² = 391318160753522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13987219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3159 + ... + 6160.

It is an arithmetic number, because the mean of its divisors is an integer number (1864000).

Almost surely, 2^13987819 is an apocalyptic number.

13987819 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

13987819 is a deficient number, since it is larger than the sum of its proper divisors (924181).

13987819 is an equidigital number, since it uses as much as digits as its factorization.

13987819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9417.

The product of its digits is 108864, while the sum is 46.

The square root of 13987819 is about 3740.0292779603. The cubic root of 13987819 is about 240.9443062710.

The spelling of 13987819 in words is "thirteen million, nine hundred eighty-seven thousand, eight hundred nineteen".