19439489 has 6 divisors (see below), whose sum is σ = 20516850. Its totient is φ = 18416016.

The previous prime is 19439477. The next prime is 19439501. The reversal of 19439489 is 98493491.

It is an interprime number because it is at equal distance from previous prime (19439477) and next prime (19439501).

It can be written as a sum of positive squares in only one way, i.e., 19430464 + 9025 = 4408^2 + 95^2 .

It is not a de Polignac number, because 19439489 - 2⁴ = 19439473 is a prime.

It is a super-2 number, since 2×19439489² = 755787465162242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19439089) 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, 26564 + ... + 27285.

It is an arithmetic number, because the mean of its divisors is an integer number (3419475).

Almost surely, 2^19439489 is an apocalyptic number.

19439489 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

19439489 is a deficient number, since it is larger than the sum of its proper divisors (1077361).

19439489 is an equidigital number, since it uses as much as digits as its factorization.

19439489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53887 (or 53868 counting only the distinct ones).

The product of its digits is 279936, while the sum is 47.

The square root of 19439489 is about 4409.0235880521. The cubic root of 19439489 is about 268.8819288079.

The spelling of 19439489 in words is "nineteen million, four hundred thirty-nine thousand, four hundred eighty-nine".