19990481 has 6 divisors (see below), whose sum is σ = 23254290. Its totient is φ = 17134656.

The previous prime is 19990459. The next prime is 19990499. The reversal of 19990481 is 18409991.

It can be written as a sum of positive squares in only one way, i.e., 10504081 + 9486400 = 3241^2 + 3080^2 .

It is not a de Polignac number, because 19990481 - 2¹⁰ = 19989457 is a prime.

It is a super-2 number, since 2×19990481² = 799238661222722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19990781) 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 5 ways as a sum of consecutive naturals, for example, 203936 + ... + 204033.

It is an arithmetic number, because the mean of its divisors is an integer number (3875715).

Almost surely, 2^19990481 is an apocalyptic number.

It is an amenable number.

19990481 is a deficient number, since it is larger than the sum of its proper divisors (3263809).

19990481 is an equidigital number, since it uses as much as digits as its factorization.

19990481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 407983 (or 407976 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 41.

The square root of 19990481 is about 4471.0715717823. The cubic root of 19990481 is about 271.3986905901.

The spelling of 19990481 in words is "nineteen million, nine hundred ninety thousand, four hundred eighty-one".