1988446469 has 2 divisors, whose sum is σ = 1988446470. Its totient is φ = 1988446468.

The previous prime is 1988446417. The next prime is 1988446517. The reversal of 1988446469 is 9646448891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1576884100 + 411562369 = 39710^2 + 20287^2 .

It is an emirp because it is prime and its reverse (9646448891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1988446469 - 2²⁴ = 1971669253 is a prime.

It is a super-2 number, since 2×1988446469² = 7907838720157135922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1988446169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 994223234 + 994223235.

It is an arithmetic number, because the mean of its divisors is an integer number (994223235).

Almost surely, 2^1988446469 is an apocalyptic number.

It is an amenable number.

1988446469 is a deficient number, since it is larger than the sum of its proper divisors (1).

1988446469 is an equidigital number, since it uses as much as digits as its factorization.

1988446469 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11943936, while the sum is 59.

The square root of 1988446469 is about 44592.0000560639. Note that the first 4 decimals coincide. The cubic root of 1988446469 is about 1257.4902737095.

The spelling of 1988446469 in words is "one billion, nine hundred eighty-eight million, four hundred forty-six thousand, four hundred sixty-nine".