1987775 has 12 divisors (see below), whose sum is σ = 2572752. Its totient is φ = 1520640.

The previous prime is 1987709. The next prime is 1987789. The reversal of 1987775 is 5777891.

It is not a de Polignac number, because 1987775 - 2⁸ = 1987519 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1154 + ... + 2303.

It is an arithmetic number, because the mean of its divisors is an integer number (214396).

2^1987775 is an apocalyptic number.

1987775 is a deficient number, since it is larger than the sum of its proper divisors (584977).

1987775 is a wasteful number, since it uses less digits than its factorization.

1987775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3490 (or 3485 counting only the distinct ones).

The product of its digits is 123480, while the sum is 44.

The square root of 1987775 is about 1409.8847470627. The cubic root of 1987775 is about 125.7348712477.

The spelling of 1987775 in words is "one million, nine hundred eighty-seven thousand, seven hundred seventy-five".