1920287 has 4 divisors (see below), whose sum is σ = 1949016. Its totient is φ = 1891560.

The previous prime is 1920283. The next prime is 1920299. The reversal of 1920287 is 7820291.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7820291 = 661 ⋅11831.

It is a cyclic number.

It is not a de Polignac number, because 1920287 - 2² = 1920283 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1920283) 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 3 ways as a sum of consecutive naturals, for example, 14264 + ... + 14397.

It is an arithmetic number, because the mean of its divisors is an integer number (487254).

2^1920287 is an apocalyptic number.

1920287 is a deficient number, since it is larger than the sum of its proper divisors (28729).

1920287 is an equidigital number, since it uses as much as digits as its factorization.

1920287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28728.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 1920287 is about 1385.7442043898. The cubic root of 1920287 is about 124.2954928166.

The spelling of 1920287 in words is "one million, nine hundred twenty thousand, two hundred eighty-seven".