1661928 has 16 divisors (see below), whose sum is σ = 4154880. Its totient is φ = 553968.

The previous prime is 1661917. The next prime is 1661939. The reversal of 1661928 is 8291661.

It is an interprime number because it is at equal distance from previous prime (1661917) and next prime (1661939).

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34600 + ... + 34647.

It is an arithmetic number, because the mean of its divisors is an integer number (259680).

2^1661928 is an apocalyptic number.

It is an amenable number.

1661928 is an abundant number, since it is smaller than the sum of its proper divisors (2492952).

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

1661928 is a wasteful number, since it uses less digits than its factorization.

1661928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69256 (or 69252 counting only the distinct ones).

The product of its digits is 5184, while the sum is 33.

The square root of 1661928 is about 1289.1578646543. The cubic root of 1661928 is about 118.4506372763.

The spelling of 1661928 in words is "one million, six hundred sixty-one thousand, nine hundred twenty-eight".