1988290 has 8 divisors (see below), whose sum is σ = 3578940. Its totient is φ = 795312.

The previous prime is 1988279. The next prime is 1988291. The reversal of 1988290 is 928891.

It can be written as a sum of positive squares in 2 ways, for example, as 1968409 + 19881 = 1403^2 + 141^2 .

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

It is not an unprimeable number, because it can be changed into a prime (1988291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99405 + ... + 99424.

2^1988290 is an apocalyptic number.

1988290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1988290 is a deficient number, since it is larger than the sum of its proper divisors (1590650).

1988290 is a wasteful number, since it uses less digits than its factorization.

1988290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198836.

The product of its (nonzero) digits is 10368, while the sum is 37.

The square root of 1988290 is about 1410.0673742768. The cubic root of 1988290 is about 125.7457289265.

It can be divided in two parts, 1988 and 290, that added together give a triangular number (2278 = T₆₇).

The spelling of 1988290 in words is "one million, nine hundred eighty-eight thousand, two hundred ninety".