1988555 has 8 divisors (see below), whose sum is σ = 2404512. Its totient is φ = 1578688.

The previous prime is 1988551. The next prime is 1988561. The reversal of 1988555 is 5558891.

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

It is a cyclic number.

It is not a de Polignac number, because 1988555 - 2² = 1988551 is a prime.

It is a super-3 number, since 3×1988555³ = 23590333286976161625, which contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1988551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 767 + ... + 2136.

It is an arithmetic number, because the mean of its divisors is an integer number (300564).

2^1988555 is an apocalyptic number.

1988555 is a deficient number, since it is larger than the sum of its proper divisors (415957).

1988555 is a wasteful number, since it uses less digits than its factorization.

1988555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3045.

The product of its digits is 72000, while the sum is 41.

The square root of 1988555 is about 1410.1613382872. The cubic root of 1988555 is about 125.7513151569.

The spelling of 1988555 in words is "one million, nine hundred eighty-eight thousand, five hundred fifty-five".