1661814 has 72 divisors (see below), whose sum is σ = 4564560. Its totient is φ = 427680.

The previous prime is 1661813. The next prime is 1661827. The reversal of 1661814 is 4181661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 15192 + ... + 15300.

2^1661814 is an apocalyptic number.

1661814 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1661814, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2282280).

1661814 is an abundant number, since it is smaller than the sum of its proper divisors (2902746).

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

1661814 is a wasteful number, since it uses less digits than its factorization.

1661814 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146 (or 132 counting only the distinct ones).

The product of its digits is 1152, while the sum is 27.

The square root of 1661814 is about 1289.1136489852. The cubic root of 1661814 is about 118.4479288394.

The spelling of 1661814 in words is "one million, six hundred sixty-one thousand, eight hundred fourteen".