1387666 has 8 divisors (see below), whose sum is σ = 2378880. Its totient is φ = 594708.

The previous prime is 1387649. The next prime is 1387667. The reversal of 1387666 is 6667831.

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

It is not an unprimeable number, because it can be changed into a prime (1387667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49546 + ... + 49573.

It is an arithmetic number, because the mean of its divisors is an integer number (297360).

2^1387666 is an apocalyptic number.

1387666 is a deficient number, since it is larger than the sum of its proper divisors (991214).

1387666 is an equidigital number, since it uses as much as digits as its factorization.

1387666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99128.

The product of its digits is 36288, while the sum is 37.

The square root of 1387666 is about 1177.9923599073. The cubic root of 1387666 is about 111.5394030470.

The spelling of 1387666 in words is "one million, three hundred eighty-seven thousand, six hundred sixty-six".