19870081 has 16 divisors (see below), whose sum is σ = 24910848. Its totient is φ = 15397200.

The previous prime is 19870063. The next prime is 19870099. The reversal of 19870081 is 18007891.

It is an interprime number because it is at equal distance from previous prime (19870063) and next prime (19870099).

It is not a de Polignac number, because 19870081 - 2¹¹ = 19868033 is a prime.

It is a super-2 number, since 2×19870081² = 789640237893122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19870021) 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 15 ways as a sum of consecutive naturals, for example, 15636 + ... + 16858.

It is an arithmetic number, because the mean of its divisors is an integer number (1556928).

Almost surely, 2^19870081 is an apocalyptic number.

19870081 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

19870081 is a deficient number, since it is larger than the sum of its proper divisors (5040767).

19870081 is a wasteful number, since it uses less digits than its factorization.

19870081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1452.

The product of its (nonzero) digits is 4032, while the sum is 34.

The square root of 19870081 is about 4457.5869032471. The cubic root of 19870081 is about 270.8527269952.

The spelling of 19870081 in words is "nineteen million, eight hundred seventy thousand, eighty-one".