1698397 has 4 divisors (see below), whose sum is σ = 1753216. Its totient is φ = 1643580.

The previous prime is 1698379. The next prime is 1698409. The reversal of 1698397 is 7938961.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7938961 = 43 ⋅184627.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1698397 is a prime.

It is a d-powerful number, because it can be written as 1 + 6⁸ + 9³ + 8³ + 3 + 9³ + 7⁵ .

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1698377) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27363 + ... + 27424.

It is an arithmetic number, because the mean of its divisors is an integer number (438304).

2^1698397 is an apocalyptic number.

It is an amenable number.

1698397 is a deficient number, since it is larger than the sum of its proper divisors (54819).

1698397 is an equidigital number, since it uses as much as digits as its factorization.

1698397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54818.

The product of its digits is 81648, while the sum is 43.

The square root of 1698397 is about 1303.2256136218. The cubic root of 1698397 is about 119.3107945809.

The spelling of 1698397 in words is "one million, six hundred ninety-eight thousand, three hundred ninety-seven".