1660698 has 48 divisors (see below), whose sum is σ = 3983616. Its totient is φ = 496800.

The previous prime is 1660697. The next prime is 1660699. The reversal of 1660698 is 8960661.

It is an interprime number because it is at equal distance from previous prime (1660697) and next prime (1660699).

It is not an unprimeable number, because it can be changed into a prime (1660691) 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 23 ways as a sum of consecutive naturals, for example, 10923 + ... + 11073.

It is an arithmetic number, because the mean of its divisors is an integer number (82992).

2^1660698 is an apocalyptic number.

1660698 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1660698, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1991808).

1660698 is an abundant number, since it is smaller than the sum of its proper divisors (2322918).

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

1660698 is a wasteful number, since it uses less digits than its factorization.

1660698 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219 (or 216 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 1660698 is about 1288.6807207373. The cubic root of 1660698 is about 118.4214081237.

The spelling of 1660698 in words is "one million, six hundred sixty thousand, six hundred ninety-eight".