1387618 has 4 divisors (see below), whose sum is σ = 2081430. Its totient is φ = 693808.

The previous prime is 1387601. The next prime is 1387649. The reversal of 1387618 is 8167831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8167831 = 7 ⋅1166833.

It can be written as a sum of positive squares in only one way, i.e., 974169 + 413449 = 987^2 + 643^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 346903 + ... + 346906.

2^1387618 is an apocalyptic number.

1387618 is a deficient number, since it is larger than the sum of its proper divisors (693812).

1387618 is an equidigital number, since it uses as much as digits as its factorization.

1387618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 693811.

The product of its digits is 8064, while the sum is 34.

The square root of 1387618 is about 1177.9719860846. The cubic root of 1387618 is about 111.5381169659.

The spelling of 1387618 in words is "one million, three hundred eighty-seven thousand, six hundred eighteen".