1987797 has 16 divisors (see below), whose sum is σ = 3061760. Its totient is φ = 1123632.

The previous prime is 1987789. The next prime is 1987819. The reversal of 1987797 is 7977891.

It is not a de Polignac number, because 1987797 - 2³ = 1987789 is a prime.

It is a Duffinian number.

1987797 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1987697) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1704 + ... + 2622.

It is an arithmetic number, because the mean of its divisors is an integer number (191360).

2^1987797 is an apocalyptic number.

It is an amenable number.

1987797 is a deficient number, since it is larger than the sum of its proper divisors (1073963).

1987797 is a wasteful number, since it uses less digits than its factorization.

1987797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1032.

The product of its digits is 222264, while the sum is 48.

The square root of 1987797 is about 1409.8925490973. The cubic root of 1987797 is about 125.7353351092.

The spelling of 1987797 in words is "one million, nine hundred eighty-seven thousand, seven hundred ninety-seven".