1986534 has 48 divisors (see below), whose sum is σ = 4792320. Its totient is φ = 589680.

The previous prime is 1986527. The next prime is 1986539. The reversal of 1986534 is 4356891.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

1986534 is a modest number, since divided by 6534 gives 198 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1986539) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15579 + ... + 15705.

It is an arithmetic number, because the mean of its divisors is an integer number (99840).

2^1986534 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1986534, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2396160).

1986534 is an abundant number, since it is smaller than the sum of its proper divisors (2805786).

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

1986534 is a wasteful number, since it uses less digits than its factorization.

1986534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225 (or 222 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 1986534 is about 1409.4445714536. Note that the first 3 decimals coincide. The cubic root of 1986534 is about 125.7086996977.

The spelling of 1986534 in words is "one million, nine hundred eighty-six thousand, five hundred thirty-four".