1987793 has 4 divisors (see below), whose sum is σ = 2104740. Its totient is φ = 1870848.

The previous prime is 1987789. The next prime is 1987819. The reversal of 1987793 is 3977891.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1459264 + 528529 = 1208^2 + 727^2 .

It is a cyclic number.

It is not a de Polignac number, because 1987793 - 2² = 1987789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1987703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58448 + ... + 58481.

It is an arithmetic number, because the mean of its divisors is an integer number (526185).

2^1987793 is an apocalyptic number.

It is an amenable number.

1987793 is a deficient number, since it is larger than the sum of its proper divisors (116947).

1987793 is a wasteful number, since it uses less digits than its factorization.

1987793 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116946.

The product of its digits is 95256, while the sum is 44.

The square root of 1987793 is about 1409.8911305487. The cubic root of 1987793 is about 125.7352507710.

The spelling of 1987793 in words is "one million, nine hundred eighty-seven thousand, seven hundred ninety-three".