1209987 has 6 divisors (see below), whose sum is σ = 1747772. Its totient is φ = 806652.

The previous prime is 1209979. The next prime is 1210003. The reversal of 1209987 is 7899021.

It is a happy number.

It is not a de Polignac number, because 1209987 - 2³ = 1209979 is a prime.

It is a Duffinian number.

1209987 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1209947) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 67213 + ... + 67230.

2^1209987 is an apocalyptic number.

1209987 is a deficient number, since it is larger than the sum of its proper divisors (537785).

1209987 is a wasteful number, since it uses less digits than its factorization.

1209987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134449 (or 134446 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The square root of 1209987 is about 1099.9940908932. The cubic root of 1209987 is about 106.5598420547.

The spelling of 1209987 in words is "one million, two hundred nine thousand, nine hundred eighty-seven".