1698406 has 4 divisors (see below), whose sum is σ = 2547612. Its totient is φ = 849202.

The previous prime is 1698379. The next prime is 1698409. The reversal of 1698406 is 6048961.

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

It is a congruent number.

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

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 424600 + ... + 424603.

It is an arithmetic number, because the mean of its divisors is an integer number (636903).

2^1698406 is an apocalyptic number.

1698406 is a deficient number, since it is larger than the sum of its proper divisors (849206).

1698406 is an equidigital number, since it uses as much as digits as its factorization.

1698406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 849205.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 1698406 is about 1303.2290665881. The cubic root of 1698406 is about 119.3110053277.

The spelling of 1698406 in words is "one million, six hundred ninety-eight thousand, four hundred six".