1660400 has 60 divisors (see below), whose sum is σ = 4566672. Its totient is φ = 568320.

The previous prime is 1660387. The next prime is 1660409. The reversal of 1660400 is 40661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1660409) 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 11 ways as a sum of consecutive naturals, for example, 2504 + ... + 3096.

2^1660400 is an apocalyptic number.

1660400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1660400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2283336).

1660400 is an abundant number, since it is smaller than the sum of its proper divisors (2906272).

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

1660400 is a wasteful number, since it uses less digits than its factorization.

1660400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 618 (or 607 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 1660400 is about 1288.5650934276. The cubic root of 1660400 is about 118.4143244174.

The spelling of 1660400 in words is "one million, six hundred sixty thousand, four hundred".