1387231 has 2 divisors, whose sum is σ = 1387232. Its totient is φ = 1387230.

The previous prime is 1387213. The next prime is 1387259. The reversal of 1387231 is 1327831.

Together with previous prime (1387213) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is an emirp because it is prime and its reverse (1327831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1387231 - 2¹¹ = 1385183 is a prime.

It is a super-2 number, since 2×1387231² = 3848819694722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1387196 and 1387205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1387261) 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 as a sum of consecutive naturals, namely, 693615 + 693616.

It is an arithmetic number, because the mean of its divisors is an integer number (693616).

2^1387231 is an apocalyptic number.

1387231 is a deficient number, since it is larger than the sum of its proper divisors (1).

1387231 is an equidigital number, since it uses as much as digits as its factorization.

1387231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1008, while the sum is 25.

The square root of 1387231 is about 1177.8077092633. The cubic root of 1387231 is about 111.5277468533.

The spelling of 1387231 in words is "one million, three hundred eighty-seven thousand, two hundred thirty-one".