1387693 has 4 divisors (see below), whose sum is σ = 1469340. Its totient is φ = 1306048.

The previous prime is 1387691. The next prime is 1387717. The reversal of 1387693 is 3967831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3967831 = 7 ⋅566833.

It can be written as a sum of positive squares in 2 ways, for example, as 1077444 + 310249 = 1038^2 + 557^2 .

It is a cyclic number.

It is not a de Polignac number, because 1387693 - 2¹ = 1387691 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 (1387691) 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 3 ways as a sum of consecutive naturals, for example, 40798 + ... + 40831.

It is an arithmetic number, because the mean of its divisors is an integer number (367335).

2^1387693 is an apocalyptic number.

It is an amenable number.

1387693 is a deficient number, since it is larger than the sum of its proper divisors (81647).

1387693 is an equidigital number, since it uses as much as digits as its factorization.

1387693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81646.

The product of its digits is 27216, while the sum is 37.

The square root of 1387693 is about 1178.0038200278. The cubic root of 1387693 is about 111.5401264546.

It can be divided in two parts, 1387 and 693, that multiplied together give a triangular number (961191 = T₁₃₈₆).

The spelling of 1387693 in words is "one million, three hundred eighty-seven thousand, six hundred ninety-three".