1698404 has 6 divisors (see below), whose sum is σ = 2972214. Its totient is φ = 849200.

The previous prime is 1698379. The next prime is 1698409. The reversal of 1698404 is 4048961.

It can be written as a sum of positive squares in only one way, i.e., 906304 + 792100 = 952^2 + 890^2 .

It is a super-2 number, since 2×1698404² = 5769152294432, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1698409) by changing a digit.

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 as a sum of consecutive naturals, namely, 212297 + ... + 212304.

It is an arithmetic number, because the mean of its divisors is an integer number (495369).

2^1698404 is an apocalyptic number.

It is an amenable number.

1698404 is a deficient number, since it is larger than the sum of its proper divisors (1273810).

1698404 is a wasteful number, since it uses less digits than its factorization.

1698404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 424605 (or 424603 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 1698404 is about 1303.2282992630. The cubic root of 1698404 is about 119.3109584952.

The spelling of 1698404 in words is "one million, six hundred ninety-eight thousand, four hundred four".