1386997 has 4 divisors (see below), whose sum is σ = 1389420. Its totient is φ = 1384576.

The previous prime is 1386991. The next prime is 1387007. The reversal of 1386997 is 7996831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7996831 = 769 ⋅10399.

It can be written as a sum of positive squares in 2 ways, for example, as 538756 + 848241 = 734^2 + 921^2 .

It is a cyclic number.

It is not a de Polignac number, because 1386997 - 2¹⁵ = 1354229 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1386991) 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, 183 + ... + 1675.

It is an arithmetic number, because the mean of its divisors is an integer number (347355).

2^1386997 is an apocalyptic number.

It is an amenable number.

1386997 is a deficient number, since it is larger than the sum of its proper divisors (2423).

1386997 is an equidigital number, since it uses as much as digits as its factorization.

1386997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2422.

The product of its digits is 81648, while the sum is 43.

The square root of 1386997 is about 1177.7083679757. The cubic root of 1386997 is about 111.5214756170.

The spelling of 1386997 in words is "one million, three hundred eighty-six thousand, nine hundred ninety-seven".