1661492 has 30 divisors (see below), whose sum is σ = 3411618. Its totient is φ = 707952.

The previous prime is 1661489. The next prime is 1661503. The reversal of 1661492 is 2941661.

It can be written as a sum of positive squares in only one way, i.e., 1623076 + 38416 = 1274^2 + 196^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 9518 + ... + 9690.

2^1661492 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1661492, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1705809).

1661492 is an abundant number, since it is smaller than the sum of its proper divisors (1750126).

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

1661492 is an equidigital number, since it uses as much as digits as its factorization.

1661492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205 (or 182 counting only the distinct ones).

The product of its digits is 2592, while the sum is 29.

The square root of 1661492 is about 1288.9887509207. The cubic root of 1661492 is about 118.4402780240.

Adding to 1661492 its sum of digits (29), we get a square (1661521 = 1289²).

The spelling of 1661492 in words is "one million, six hundred sixty-one thousand, four hundred ninety-two".