1986542 has 12 divisors (see below), whose sum is σ = 3093216. Its totient is φ = 955860.

The previous prime is 1986541. The next prime is 1986547. The reversal of 1986542 is 2456891.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1986541) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11009 + ... + 11187.

It is an arithmetic number, because the mean of its divisors is an integer number (257768).

2^1986542 is an apocalyptic number.

1986542 is a deficient number, since it is larger than the sum of its proper divisors (1106674).

1986542 is an equidigital number, since it uses as much as digits as its factorization.

1986542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391 (or 212 counting only the distinct ones).

The product of its digits is 17280, while the sum is 35.

The square root of 1986542 is about 1409.4474094481. The cubic root of 1986542 is about 125.7088684452.

The spelling of 1986542 in words is "one million, nine hundred eighty-six thousand, five hundred forty-two".