1661912 has 32 divisors (see below), whose sum is σ = 3628800. Its totient is φ = 698784.

The previous prime is 1661899. The next prime is 1661917. The reversal of 1661912 is 2191661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661917) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3053 + ... + 3555.

It is an arithmetic number, because the mean of its divisors is an integer number (113400).

2^1661912 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 1661912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1814400).

1661912 is an abundant number, since it is smaller than the sum of its proper divisors (1966888).

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

1661912 is a wasteful number, since it uses less digits than its factorization.

1661912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 575 (or 571 counting only the distinct ones).

The product of its digits is 648, while the sum is 26.

The square root of 1661912 is about 1289.1516590378. The cubic root of 1661912 is about 118.4502571523.

The spelling of 1661912 in words is "one million, six hundred sixty-one thousand, nine hundred twelve".