1987248449 has 4 divisors (see below), whose sum is σ = 1992784320. Its totient is φ = 1981712580.

The previous prime is 1987248421. The next prime is 1987248457. The reversal of 1987248449 is 9448427891.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1987248449 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1987248394 and 1987248403.

It is not an unprimeable number, because it can be changed into a prime (1987248469) 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 in 3 ways as a sum of consecutive naturals, for example, 2767397 + ... + 2768114.

It is an arithmetic number, because the mean of its divisors is an integer number (498196080).

Almost surely, 2^1987248449 is an apocalyptic number.

It is an amenable number.

1987248449 is a deficient number, since it is larger than the sum of its proper divisors (5535871).

1987248449 is an equidigital number, since it uses as much as digits as its factorization.

1987248449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5535870.

The product of its digits is 4644864, while the sum is 56.

The square root of 1987248449 is about 44578.5649051200. The cubic root of 1987248449 is about 1257.2376810159.

The spelling of 1987248449 in words is "one billion, nine hundred eighty-seven million, two hundred forty-eight thousand, four hundred forty-nine".