1920729 has 16 divisors (see below), whose sum is σ = 2785280. Its totient is φ = 1172880.

The previous prime is 1920713. The next prime is 1920731. The reversal of 1920729 is 9270291.

It is not a de Polignac number, because 1920729 - 2⁴ = 1920713 is a prime.

It is a Duffinian number.

1920729 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1920696 and 1920705.

It is not an unprimeable number, because it can be changed into a prime (1920739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1224 + ... + 2310.

It is an arithmetic number, because the mean of its divisors is an integer number (174080).

2^1920729 is an apocalyptic number.

1920729 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1920729 is a deficient number, since it is larger than the sum of its proper divisors (864551).

1920729 is a wasteful number, since it uses less digits than its factorization.

1920729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1140.

The product of its (nonzero) digits is 2268, while the sum is 30.

The square root of 1920729 is about 1385.9036763065. The cubic root of 1920729 is about 124.3050286123.

The spelling of 1920729 in words is "one million, nine hundred twenty thousand, seven hundred twenty-nine".