1661376 has 56 divisors (see below), whose sum is σ = 4663440. Its totient is φ = 520192.

The previous prime is 1661353. The next prime is 1661431. The reversal of 1661376 is 6731661.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3010 + ... + 3518.

2^1661376 is an apocalyptic number.

1661376 is a gapful number since it is divisible by the number (16) 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 1661376, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2331720).

1661376 is an abundant number, since it is smaller than the sum of its proper divisors (3002064).

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

1661376 is a wasteful number, since it uses less digits than its factorization.

1661376 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 541 (or 531 counting only the distinct ones).

The product of its digits is 4536, while the sum is 30.

The square root of 1661376 is about 1288.9437536215. The cubic root of 1661376 is about 118.4375215874.

The spelling of 1661376 in words is "one million, six hundred sixty-one thousand, three hundred seventy-six".