1387986 has 8 divisors (see below), whose sum is σ = 2775984. Its totient is φ = 462660.

The previous prime is 1387961. The next prime is 1387987. The reversal of 1387986 is 6897831.

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

1387986 is an admirable number.

It is a d-powerful number, because it can be written as 1 + 3¹² + 8 + 7⁷ + 9 + 8⁵ + 6³ .

It is not an unprimeable number, because it can be changed into a prime (1387987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 115660 + ... + 115671.

It is an arithmetic number, because the mean of its divisors is an integer number (346998).

2^1387986 is an apocalyptic number.

1387986 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1387986 is a wasteful number, since it uses less digits than its factorization.

1387986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231336.

The product of its digits is 72576, while the sum is 42.

The square root of 1387986 is about 1178.1281763883. The cubic root of 1387986 is about 111.5479761633.

The spelling of 1387986 in words is "one million, three hundred eighty-seven thousand, nine hundred eighty-six".