1988403 has 8 divisors (see below), whose sum is σ = 2678928. Its totient is φ = 1311744.

The previous prime is 1988353. The next prime is 1988411. The reversal of 1988403 is 3048891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1988403 - 2⁶ = 1988339 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1988423) 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 7 ways as a sum of consecutive naturals, for example, 3126 + ... + 3707.

It is an arithmetic number, because the mean of its divisors is an integer number (334866).

2^1988403 is an apocalyptic number.

1988403 is a deficient number, since it is larger than the sum of its proper divisors (690525).

1988403 is an equidigital number, since it uses as much as digits as its factorization.

1988403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6933.

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 1988403 is about 1410.1074427149. The cubic root of 1988403 is about 125.7481110401.

The spelling of 1988403 in words is "one million, nine hundred eighty-eight thousand, four hundred three".