1387697 has 4 divisors (see below), whose sum is σ = 1390116. Its totient is φ = 1385280.

The previous prime is 1387691. The next prime is 1387717. The reversal of 1387697 is 7967831.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 287296 + 1100401 = 536^2 + 1049^2 .

It is a cyclic number.

It is not a de Polignac number, because 1387697 - 2⁴ = 1387681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1387691) 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, 197 + ... + 1677.

It is an arithmetic number, because the mean of its divisors is an integer number (347529).

2^1387697 is an apocalyptic number.

It is an amenable number.

1387697 is a deficient number, since it is larger than the sum of its proper divisors (2419).

1387697 is an equidigital number, since it uses as much as digits as its factorization.

1387697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2418.

The product of its digits is 63504, while the sum is 41.

The square root of 1387697 is about 1178.0055178139. The cubic root of 1387697 is about 111.5402336253.

The spelling of 1387697 in words is "one million, three hundred eighty-seven thousand, six hundred ninety-seven".