1387917 has 6 divisors (see below), whose sum is σ = 2004782. Its totient is φ = 925272.

The previous prime is 1387913. The next prime is 1387921. The reversal of 1387917 is 7197831.

It is an interprime number because it is at equal distance from previous prime (1387913) and next prime (1387921).

It can be written as a sum of positive squares in only one way, i.e., 1052676 + 335241 = 1026^2 + 579^2 .

It is not a de Polignac number, because 1387917 - 2² = 1387913 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 (1387913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 77098 + ... + 77115.

2^1387917 is an apocalyptic number.

It is an amenable number.

1387917 is a deficient number, since it is larger than the sum of its proper divisors (616865).

1387917 is a wasteful number, since it uses less digits than its factorization.

1387917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154219 (or 154216 counting only the distinct ones).

The product of its digits is 10584, while the sum is 36.

The square root of 1387917 is about 1178.0988922837. The cubic root of 1387917 is about 111.5461276965.

It can be divided in two parts, 1387 and 917, that added together give a square (2304 = 48²).

The spelling of 1387917 in words is "one million, three hundred eighty-seven thousand, nine hundred seventeen".