1783920 has 40 divisors (see below), whose sum is σ = 5530896. Its totient is φ = 475648.

The previous prime is 1783907. The next prime is 1783921. The reversal of 1783920 is 293871.

It is a happy number.

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

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1783921) 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, 3477 + ... + 3956.

2^1783920 is an apocalyptic number.

1783920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1783920 is an abundant number, since it is smaller than the sum of its proper divisors (3746976).

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

1783920 is a wasteful number, since it uses less digits than its factorization.

1783920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7449 (or 7443 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 1783920 is about 1335.6346805920. The cubic root of 1783920 is about 121.2807269701.

The spelling of 1783920 in words is "one million, seven hundred eighty-three thousand, nine hundred twenty".