1986340 has 12 divisors (see below), whose sum is σ = 4171356. Its totient is φ = 794528.

The previous prime is 1986337. The next prime is 1986359. The reversal of 1986340 is 436891.

It can be written as a sum of positive squares in 2 ways, for example, as 527076 + 1459264 = 726^2 + 1208^2 .

It is an unprimeable number.

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, 49639 + ... + 49678.

It is an arithmetic number, because the mean of its divisors is an integer number (347613).

2^1986340 is an apocalyptic number.

1986340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1986340 is an abundant number, since it is smaller than the sum of its proper divisors (2185016).

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

1986340 is a wasteful number, since it uses less digits than its factorization.

1986340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99326 (or 99324 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 1986340 is about 1409.3757483368. The cubic root of 1986340 is about 125.7046074308.

It can be divided in two parts, 198 and 6340, that multiplied together give a triangular number (1255320 = T₁₅₈₄).

The spelling of 1986340 in words is "one million, nine hundred eighty-six thousand, three hundred forty".