1920445 has 4 divisors (see below), whose sum is σ = 2304540. Its totient is φ = 1536352.

The previous prime is 1920437. The next prime is 1920469. The reversal of 1920445 is 5440291.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5440291 = 53 ⋅102647.

It can be written as a sum of positive squares in 2 ways, for example, as 436921 + 1483524 = 661^2 + 1218^2 .

It is a cyclic number.

It is not a de Polignac number, because 1920445 - 2³ = 1920437 is a prime.

It is an Ulam number.

It is a congruent number.

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, 192040 + ... + 192049.

It is an arithmetic number, because the mean of its divisors is an integer number (576135).

2^1920445 is an apocalyptic number.

It is an amenable number.

1920445 is a deficient number, since it is larger than the sum of its proper divisors (384095).

1920445 is an equidigital number, since it uses as much as digits as its factorization.

1920445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 384094.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 1920445 is about 1385.8012122956. The cubic root of 1920445 is about 124.2989017080.

The spelling of 1920445 in words is "one million, nine hundred twenty thousand, four hundred forty-five".