19872481 has 2 divisors, whose sum is σ = 19872482. Its totient is φ = 19872480.

The previous prime is 19872467. The next prime is 19872491. The reversal of 19872481 is 18427891.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16128256 + 3744225 = 4016^2 + 1935^2 .

It is a cyclic number.

It is not a de Polignac number, because 19872481 - 2⁷ = 19872353 is a prime.

It is a super-2 number, since 2×19872481² = 789831002190722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (19872421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9936240 + 9936241.

It is an arithmetic number, because the mean of its divisors is an integer number (9936241).

Almost surely, 2^19872481 is an apocalyptic number.

It is an amenable number.

19872481 is a deficient number, since it is larger than the sum of its proper divisors (1).

19872481 is an equidigital number, since it uses as much as digits as its factorization.

19872481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32256, while the sum is 40.

The square root of 19872481 is about 4457.8560990683. The cubic root of 19872481 is about 270.8636315032.

The spelling of 19872481 in words is "nineteen million, eight hundred seventy-two thousand, four hundred eighty-one".