1987993 has 8 divisors (see below), whose sum is σ = 2298240. Its totient is φ = 1684320.

The previous prime is 1987991. The next prime is 1988011. The reversal of 1987993 is 3997891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1987993 - 2¹ = 1987991 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1987991) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 973 + ... + 2218.

It is an arithmetic number, because the mean of its divisors is an integer number (287280).

2^1987993 is an apocalyptic number.

It is an amenable number.

1987993 is a deficient number, since it is larger than the sum of its proper divisors (310247).

1987993 is an equidigital number, since it uses as much as digits as its factorization.

1987993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3287.

The product of its digits is 122472, while the sum is 46.

The square root of 1987993 is about 1409.9620562270. The cubic root of 1987993 is about 125.7394675426.

It can be divided in two parts, 1987 and 993, that multiplied together give a triangular number (1973091 = T₁₉₈₆).

The spelling of 1987993 in words is "one million, nine hundred eighty-seven thousand, nine hundred ninety-three".