1387689 has 8 divisors (see below), whose sum is σ = 1880832. Its totient is φ = 909840.

The previous prime is 1387681. The next prime is 1387691. The reversal of 1387689 is 9867831.

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

It is not a de Polignac number, because 1387689 - 2³ = 1387681 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1387689.

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, 3609 + ... + 3974.

It is an arithmetic number, because the mean of its divisors is an integer number (235104).

2^1387689 is an apocalyptic number.

It is an amenable number.

1387689 is a deficient number, since it is larger than the sum of its proper divisors (493143).

1387689 is an equidigital number, since it uses as much as digits as its factorization.

1387689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7647.

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

The square root of 1387689 is about 1178.0021222392. The cubic root of 1387689 is about 111.5400192837.

The spelling of 1387689 in words is "one million, three hundred eighty-seven thousand, six hundred eighty-nine".