1988919 has 12 divisors (see below), whose sum is σ = 2885376. Its totient is φ = 1320192.

The previous prime is 1988897. The next prime is 1988933. The reversal of 1988919 is 9198891.

It is not a de Polignac number, because 1988919 - 2⁵ = 1988887 is a prime.

It is a super-2 number, since 2×1988919² = 7911597577122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1988999) 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 11 ways as a sum of consecutive naturals, for example, 3159 + ... + 3735.

It is an arithmetic number, because the mean of its divisors is an integer number (240448).

2^1988919 is an apocalyptic number.

1988919 is a deficient number, since it is larger than the sum of its proper divisors (896457).

1988919 is a wasteful number, since it uses less digits than its factorization.

1988919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 966 (or 963 counting only the distinct ones).

The product of its digits is 46656, while the sum is 45.

The square root of 1988919 is about 1410.2903956278. The cubic root of 1988919 is about 125.7589875096.

The spelling of 1988919 in words is "one million, nine hundred eighty-eight thousand, nine hundred nineteen".