1986387 has 24 divisors (see below), whose sum is σ = 3002832. Its totient is φ = 1160640.

The previous prime is 1986373. The next prime is 1986401. The reversal of 1986387 is 7836891.

It is an interprime number because it is at equal distance from previous prime (1986373) and next prime (1986401).

It is not a de Polignac number, because 1986387 - 2⁶ = 1986323 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1986337) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 37453 + ... + 37505.

It is an arithmetic number, because the mean of its divisors is an integer number (125118).

2^1986387 is an apocalyptic number.

1986387 is a deficient number, since it is larger than the sum of its proper divisors (1016445).

1986387 is a wasteful number, since it uses less digits than its factorization.

1986387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131 (or 100 counting only the distinct ones).

The product of its digits is 72576, while the sum is 42.

The square root of 1986387 is about 1409.3924222870. The cubic root of 1986387 is about 125.7055988808.

The spelling of 1986387 in words is "one million, nine hundred eighty-six thousand, three hundred eighty-seven".