1988977 has 4 divisors (see below), whose sum is σ = 2093680. Its totient is φ = 1884276.

The previous prime is 1988963. The next prime is 1988999. The reversal of 1988977 is 7798891.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1988977 - 2¹⁹ = 1464689 is a prime.

It is a Duffinian number.

1988977 is a lucky number.

It is a plaindrome in base 14.

It is a self number, because there is not a number n which added to its sum of digits gives 1988977.

It is not an unprimeable number, because it can be changed into a prime (1988177) 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, 52323 + ... + 52360.

It is an arithmetic number, because the mean of its divisors is an integer number (523420).

2^1988977 is an apocalyptic number.

It is an amenable number.

1988977 is a deficient number, since it is larger than the sum of its proper divisors (104703).

1988977 is a wasteful number, since it uses less digits than its factorization.

1988977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104702.

The product of its digits is 254016, while the sum is 49.

The square root of 1988977 is about 1410.3109586187. The cubic root of 1988977 is about 125.7602099408.

The spelling of 1988977 in words is "one million, nine hundred eighty-eight thousand, nine hundred seventy-seven".