1387297 has 4 divisors (see below), whose sum is σ = 1392516. Its totient is φ = 1382080.

The previous prime is 1387289. The next prime is 1387313. The reversal of 1387297 is 7927831.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 772641 + 614656 = 879^2 + 784^2 .

It is a cyclic number.

It is not a de Polignac number, because 1387297 - 2³ = 1387289 is a prime.

It is a Duffinian number.

1387297 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1387207) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2188 + ... + 2749.

It is an arithmetic number, because the mean of its divisors is an integer number (348129).

2^1387297 is an apocalyptic number.

It is an amenable number.

1387297 is a deficient number, since it is larger than the sum of its proper divisors (5219).

1387297 is an equidigital number, since it uses as much as digits as its factorization.

1387297 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5218.

The product of its digits is 21168, while the sum is 37.

The square root of 1387297 is about 1177.8357270859. The cubic root of 1387297 is about 111.5295155360.

The spelling of 1387297 in words is "one million, three hundred eighty-seven thousand, two hundred ninety-seven".