1986920 has 32 divisors (see below), whose sum is σ = 4815720. Its totient is φ = 733440.

The previous prime is 1986913. The next prime is 1986923. The reversal of 1986920 is 296891.

It can be written as a sum of positive squares in 4 ways, for example, as 1643524 + 343396 = 1282^2 + 586^2 .

It is not an unprimeable number, because it can be changed into a prime (1986923) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1391 + ... + 2430.

2^1986920 is an apocalyptic number.

1986920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1986920 is an abundant number, since it is smaller than the sum of its proper divisors (2828800).

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

1986920 is a wasteful number, since it uses less digits than its factorization.

1986920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3845 (or 3841 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 1986920 is about 1409.5814981760. The cubic root of 1986920 is about 125.7168412507.

The spelling of 1986920 in words is "one million, nine hundred eighty-six thousand, nine hundred twenty".