1371987 has 6 divisors (see below), whose sum is σ = 1981772. Its totient is φ = 914652.

The previous prime is 1371949. The next prime is 1371989. The reversal of 1371987 is 7891731.

It is not a de Polignac number, because 1371987 - 2⁸ = 1371731 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1371989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 76213 + ... + 76230.

2^1371987 is an apocalyptic number.

1371987 is a deficient number, since it is larger than the sum of its proper divisors (609785).

1371987 is a wasteful number, since it uses less digits than its factorization.

1371987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152449 (or 152446 counting only the distinct ones).

The product of its digits is 10584, while the sum is 36.

The square root of 1371987 is about 1171.3184878589. The cubic root of 1371987 is about 111.1177226807.

The spelling of 1371987 in words is "one million, three hundred seventy-one thousand, nine hundred eighty-seven".