1992987 has 12 divisors (see below), whose sum is σ = 2894320. Its totient is φ = 1321488.

The previous prime is 1992983. The next prime is 1993031. The reversal of 1992987 is 7892991.

It is not a de Polignac number, because 1992987 - 2² = 1992983 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1992983) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1578 + ... + 2544.

2^1992987 is an apocalyptic number.

1992987 is a deficient number, since it is larger than the sum of its proper divisors (901333).

1992987 is a wasteful number, since it uses less digits than its factorization.

1992987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1202 (or 1199 counting only the distinct ones).

The product of its digits is 81648, while the sum is 45.

The square root of 1992987 is about 1411.7319150604. The cubic root of 1992987 is about 125.8446687545.

The spelling of 1992987 in words is "one million, nine hundred ninety-two thousand, nine hundred eighty-seven".