1397687 has 8 divisors (see below), whose sum is σ = 1481856. Its totient is φ = 1315512.

The previous prime is 1397681. The next prime is 1397717. The reversal of 1397687 is 7867931.

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

It is a cyclic number.

It is not a de Polignac number, because 1397687 - 2¹⁰ = 1396663 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1397681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1088 + ... + 1994.

It is an arithmetic number, because the mean of its divisors is an integer number (185232).

2^1397687 is an apocalyptic number.

1397687 is a deficient number, since it is larger than the sum of its proper divisors (84169).

1397687 is an equidigital number, since it uses as much as digits as its factorization.

1397687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 997.

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

The square root of 1397687 is about 1182.2381316808. The cubic root of 1397687 is about 111.8072524505.

The spelling of 1397687 in words is "one million, three hundred ninety-seven thousand, six hundred eighty-seven".