1669398 has 8 divisors (see below), whose sum is σ = 3338808. Its totient is φ = 556464.

The previous prime is 1669391. The next prime is 1669399. The reversal of 1669398 is 8939661.

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

1669398 is an admirable number.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1669391) 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 in 3 ways as a sum of consecutive naturals, for example, 139111 + ... + 139122.

It is an arithmetic number, because the mean of its divisors is an integer number (417351).

2^1669398 is an apocalyptic number.

1669398 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1669398 is a wasteful number, since it uses less digits than its factorization.

1669398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278238.

The product of its digits is 69984, while the sum is 42.

The square root of 1669398 is about 1292.0518565445. The cubic root of 1669398 is about 118.6278418767.

The spelling of 1669398 in words is "one million, six hundred sixty-nine thousand, three hundred ninety-eight".