1988720 has 20 divisors (see below), whose sum is σ = 4623960. Its totient is φ = 795456.

The previous prime is 1988699. The next prime is 1988729. The reversal of 1988720 is 278891.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (20).

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12350 + ... + 12509.

It is an arithmetic number, because the mean of its divisors is an integer number (231198).

2^1988720 is an apocalyptic number.

1988720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1988720 is an abundant number, since it is smaller than the sum of its proper divisors (2635240).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1988720 is a wasteful number, since it uses less digits than its factorization.

1988720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24872 (or 24866 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 35.

The square root of 1988720 is about 1410.2198410177. The cubic root of 1988720 is about 125.7547931250.

The spelling of 1988720 in words is "one million, nine hundred eighty-eight thousand, seven hundred twenty".