1920447 has 6 divisors (see below), whose sum is σ = 2773992. Its totient is φ = 1280292.

The previous prime is 1920437. The next prime is 1920469. The reversal of 1920447 is 7440291.

It is a happy number.

It is not a de Polignac number, because 1920447 - 2⁶ = 1920383 is a prime.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 1920447.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1920407) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 106683 + ... + 106700.

It is an arithmetic number, because the mean of its divisors is an integer number (462332).

2^1920447 is an apocalyptic number.

1920447 is a deficient number, since it is larger than the sum of its proper divisors (853545).

1920447 is a wasteful number, since it uses less digits than its factorization.

1920447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213389 (or 213386 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 1920447 is about 1385.8019338996. The cubic root of 1920447 is about 124.2989448573.

The spelling of 1920447 in words is "one million, nine hundred twenty thousand, four hundred forty-seven".