1788249449 has 4 divisors (see below), whose sum is σ = 2043713664. Its totient is φ = 1532785236.

The previous prime is 1788249443. The next prime is 1788249461. The reversal of 1788249449 is 9449428871.

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 not a de Polignac number, because 1788249449 - 2²⁸ = 1519813993 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1788249394 and 1788249403.

It is not an unprimeable number, because it can be changed into a prime (1788249443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 127732097 + ... + 127732110.

It is an arithmetic number, because the mean of its divisors is an integer number (510928416).

Almost surely, 2^1788249449 is an apocalyptic number.

It is an amenable number.

1788249449 is a deficient number, since it is larger than the sum of its proper divisors (255464215).

1788249449 is an equidigital number, since it uses as much as digits as its factorization.

1788249449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255464214.

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

The square root of 1788249449 is about 42287.6985540713. The cubic root of 1788249449 is about 1213.7876098457.

The spelling of 1788249449 in words is "one billion, seven hundred eighty-eight million, two hundred forty-nine thousand, four hundred forty-nine".