1988285 has 16 divisors (see below), whose sum is σ = 2598960. Its totient is φ = 1460160.

The previous prime is 1988279. The next prime is 1988291. The reversal of 1988285 is 5828891.

It is an interprime number because it is at equal distance from previous prime (1988279) and next prime (1988291).

It can be written as a sum of positive squares in 8 ways, for example, as 1923769 + 64516 = 1387^2 + 254^2 .

It is not a de Polignac number, because 1988285 - 2⁶ = 1988221 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10895 + ... + 11075.

It is an arithmetic number, because the mean of its divisors is an integer number (162435).

2^1988285 is an apocalyptic number.

It is an amenable number.

1988285 is a deficient number, since it is larger than the sum of its proper divisors (610675).

1988285 is an equidigital number, since it uses as much as digits as its factorization.

1988285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225 (or 199 counting only the distinct ones).

The product of its digits is 46080, while the sum is 41.

The square root of 1988285 is about 1410.0656013108. The cubic root of 1988285 is about 125.7456235212.

Subtracting 1988285 from its reverse (5828891), we obtain a triangular number (3840606 = T₂₇₇₁).

It can be divided in two parts, 1988 and 285, that multiplied together give a triangular number (566580 = T₁₀₆₄).

The spelling of 1988285 in words is "one million, nine hundred eighty-eight thousand, two hundred eighty-five".