1987798 has 16 divisors (see below), whose sum is σ = 3156480. Its totient is φ = 936936.

The previous prime is 1987789. The next prime is 1987819. The reversal of 1987798 is 8977891.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3361 + ... + 3907.

It is an arithmetic number, because the mean of its divisors is an integer number (197280).

2^1987798 is an apocalyptic number.

1987798 is a deficient number, since it is larger than the sum of its proper divisors (1168682).

1987798 is a wasteful number, since it uses less digits than its factorization.

1987798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 651.

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

The square root of 1987798 is about 1409.8929037342. The cubic root of 1987798 is about 125.7353561938.

The spelling of 1987798 in words is "one million, nine hundred eighty-seven thousand, seven hundred ninety-eight".