1986977 has 4 divisors (see below), whose sum is σ = 2103876. Its totient is φ = 1870080.

The previous prime is 1986967. The next prime is 1986989. The reversal of 1986977 is 7796891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7796891 = 769 ⋅10139.

It can be written as a sum of positive squares in 2 ways, for example, as 712336 + 1274641 = 844^2 + 1129^2 .

It is a cyclic number.

It is not a de Polignac number, because 1986977 - 2⁶ = 1986913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1986967) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58424 + ... + 58457.

It is an arithmetic number, because the mean of its divisors is an integer number (525969).

2^1986977 is an apocalyptic number.

1986977 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1986977 is a deficient number, since it is larger than the sum of its proper divisors (116899).

1986977 is a wasteful number, since it uses less digits than its factorization.

1986977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116898.

The product of its digits is 190512, while the sum is 47.

The square root of 1986977 is about 1409.6017167980. The cubic root of 1986977 is about 125.7180434114.

The spelling of 1986977 in words is "one million, nine hundred eighty-six thousand, nine hundred seventy-seven".