1920491 has 4 divisors (see below), whose sum is σ = 1931400. Its totient is φ = 1909584.

The previous prime is 1920487. The next prime is 1920497. The reversal of 1920491 is 1940291.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1920491 - 2² = 1920487 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1920491.

It is not an unprimeable number, because it can be changed into a prime (1920497) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5186 + ... + 5543.

It is an arithmetic number, because the mean of its divisors is an integer number (482850).

2^1920491 is an apocalyptic number.

1920491 is a deficient number, since it is larger than the sum of its proper divisors (10909).

1920491 is a wasteful number, since it uses less digits than its factorization.

1920491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10908.

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 1920491 is about 1385.8178090932. The cubic root of 1920491 is about 124.2998941349.

The spelling of 1920491 in words is "one million, nine hundred twenty thousand, four hundred ninety-one".