1387686 has 16 divisors (see below), whose sum is σ = 2843568. Its totient is φ = 451200.

The previous prime is 1387681. The next prime is 1387691. The reversal of 1387686 is 6867831.

It is an interprime number because it is at equal distance from previous prime (1387681) and next prime (1387691).

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1387681) 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, 2575 + ... + 3066.

It is an arithmetic number, because the mean of its divisors is an integer number (177723).

2^1387686 is an apocalyptic number.

1387686 is an abundant number, since it is smaller than the sum of its proper divisors (1455882).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1387686 is a wasteful number, since it uses less digits than its factorization.

1387686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5687.

The product of its digits is 48384, while the sum is 39.

The square root of 1387686 is about 1178.0008488961. Note that the first 3 decimals coincide. The cubic root of 1387686 is about 111.5399389054.

The spelling of 1387686 in words is "one million, three hundred eighty-seven thousand, six hundred eighty-six".