1397815 has 8 divisors (see below), whose sum is σ = 1705248. Its totient is φ = 1099680.

The previous prime is 1397783. The next prime is 1397833. The reversal of 1397815 is 5187931.

It is a happy number.

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

It is not a de Polignac number, because 1397815 - 2⁵ = 1397783 is a prime.

It is a Duffinian number.

1397815 is a lucky number.

It is a nialpdrome in base 11.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1987 + ... + 2596.

It is an arithmetic number, because the mean of its divisors is an integer number (213156).

2^1397815 is an apocalyptic number.

1397815 is a deficient number, since it is larger than the sum of its proper divisors (307433).

1397815 is an equidigital number, since it uses as much as digits as its factorization.

1397815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4649.

The product of its digits is 7560, while the sum is 34.

The square root of 1397815 is about 1182.2922650512. The cubic root of 1397815 is about 111.8106654444.

The spelling of 1397815 in words is "one million, three hundred ninety-seven thousand, eight hundred fifteen".