1387217 has 8 divisors (see below), whose sum is σ = 1582056. Its totient is φ = 1204992.

The previous prime is 1387213. The next prime is 1387231. The reversal of 1387217 is 7127831.

It can be written as a sum of positive squares in 4 ways, for example, as 524176 + 863041 = 724^2 + 929^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1387217 - 2² = 1387213 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1387217.

It is not an unprimeable number, because it can be changed into a prime (1387213) 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, 2918 + ... + 3359.

It is an arithmetic number, because the mean of its divisors is an integer number (197757).

2^1387217 is an apocalyptic number.

1387217 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1387217 is a deficient number, since it is larger than the sum of its proper divisors (194839).

1387217 is a wasteful number, since it uses less digits than its factorization.

1387217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6307.

The product of its digits is 2352, while the sum is 29.

The square root of 1387217 is about 1177.8017660031. The cubic root of 1387217 is about 111.5273716710.

The spelling of 1387217 in words is "one million, three hundred eighty-seven thousand, two hundred seventeen".