1988749 has 12 divisors (see below), whose sum is σ = 2401824. Its totient is φ = 1612872.

The previous prime is 1988729. The next prime is 1988759. The reversal of 1988749 is 9478891.

It is a happy number.

It is not a de Polignac number, because 1988749 - 2⁹ = 1988237 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1988699 and 1988708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1988729) 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 11 ways as a sum of consecutive naturals, for example, 2134 + ... + 2920.

It is an arithmetic number, because the mean of its divisors is an integer number (200152).

2^1988749 is an apocalyptic number.

1988749 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1988749 is a deficient number, since it is larger than the sum of its proper divisors (413075).

1988749 is an equidigital number, since it uses as much as digits as its factorization.

1988749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 832 (or 813 counting only the distinct ones).

The product of its digits is 145152, while the sum is 46.

The square root of 1988749 is about 1410.2301230650. The cubic root of 1988749 is about 125.7554043844.

The spelling of 1988749 in words is "one million, nine hundred eighty-eight thousand, seven hundred forty-nine".