1987199 has 4 divisors (see below), whose sum is σ = 1998360. Its totient is φ = 1976040.

The previous prime is 1987189. The next prime is 1987201. The reversal of 1987199 is 9917891.

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

It is a cyclic number.

It is not a de Polignac number, because 1987199 - 2¹² = 1983103 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 (1987189) 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, 5309 + ... + 5670.

It is an arithmetic number, because the mean of its divisors is an integer number (499590).

2^1987199 is an apocalyptic number.

1987199 is a deficient number, since it is larger than the sum of its proper divisors (11161).

1987199 is a wasteful number, since it uses less digits than its factorization.

1987199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11160.

The product of its digits is 40824, while the sum is 44.

The square root of 1987199 is about 1409.6804602462. The cubic root of 1987199 is about 125.7227252918.

The spelling of 1987199 in words is "one million, nine hundred eighty-seven thousand, one hundred ninety-nine".