1791920 has 40 divisors (see below), whose sum is σ = 4489296. Its totient is φ = 661248.

The previous prime is 1791901. The next prime is 1791941. The reversal of 1791920 is 291971.

It is a tau number, because it is divible by the number of its divisors (40).

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, 179 + ... + 1901.

2^1791920 is an apocalyptic number.

1791920 is a gapful number since it is divisible by the number (10) 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 1791920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2244648).

1791920 is an abundant number, since it is smaller than the sum of its proper divisors (2697376).

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

1791920 is a wasteful number, since it uses less digits than its factorization.

1791920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1749 (or 1743 counting only the distinct ones).

The product of its (nonzero) digits is 1134, while the sum is 29.

The square root of 1791920 is about 1338.6261614058. The cubic root of 1791920 is about 121.4617513547.

The spelling of 1791920 in words is "one million, seven hundred ninety-one thousand, nine hundred twenty".