1988747 has 4 divisors (see below), whose sum is σ = 1997736. Its totient is φ = 1979760.

The previous prime is 1988729. The next prime is 1988759. The reversal of 1988747 is 7478891.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1988747 - 2⁶ = 1988683 is a prime.

It is a super-2 number, since 2×1988747² = 7910229260018, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1988698 and 1988707.

It is not an unprimeable number, because it can be changed into a prime (1988797) 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 3 ways as a sum of consecutive naturals, for example, 4154 + ... + 4607.

It is an arithmetic number, because the mean of its divisors is an integer number (499434).

2^1988747 is an apocalyptic number.

1988747 is a deficient number, since it is larger than the sum of its proper divisors (8989).

1988747 is an equidigital number, since it uses as much as digits as its factorization.

1988747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8988.

The product of its digits is 112896, while the sum is 44.

The square root of 1988747 is about 1410.2294139607. The cubic root of 1988747 is about 125.7553622288.

The spelling of 1988747 in words is "one million, nine hundred eighty-eight thousand, seven hundred forty-seven".