1387843 has 8 divisors (see below), whose sum is σ = 1467648. Its totient is φ = 1309704.

The previous prime is 1387823. The next prime is 1387847. The reversal of 1387843 is 3487831.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1387843 is a prime.

It is a super-2 number, since 2×1387843² = 3852216385298, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1387799 and 1387808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1387847) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1546 + ... + 2272.

It is an arithmetic number, because the mean of its divisors is an integer number (183456).

2^1387843 is an apocalyptic number.

1387843 is a deficient number, since it is larger than the sum of its proper divisors (79805).

1387843 is an equidigital number, since it uses as much as digits as its factorization.

1387843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 833.

The product of its digits is 16128, while the sum is 34.

The square root of 1387843 is about 1178.0674853335. The cubic root of 1387843 is about 111.5441452148.

The spelling of 1387843 in words is "one million, three hundred eighty-seven thousand, eight hundred forty-three".