1988506 has 8 divisors (see below), whose sum is σ = 3212244. Its totient is φ = 917760.

The previous prime is 1988471. The next prime is 1988513. The reversal of 1988506 is 6058891.

It can be written as a sum of positive squares in 2 ways, for example, as 1418481 + 570025 = 1191^2 + 755^2 .

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

It is a super-2 number, since 2×1988506² = 7908312224072, which contains 22 as substring.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 38215 + ... + 38266.

2^1988506 is an apocalyptic number.

1988506 is a deficient number, since it is larger than the sum of its proper divisors (1223738).

1988506 is a wasteful number, since it uses less digits than its factorization.

1988506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76496.

The product of its (nonzero) digits is 17280, while the sum is 37.

The square root of 1988506 is about 1410.1439642817. The cubic root of 1988506 is about 125.7502822686.

The spelling of 1988506 in words is "one million, nine hundred eighty-eight thousand, five hundred six".