1921145 has 8 divisors (see below), whose sum is σ = 2317056. Its totient is φ = 1529136.

The previous prime is 1921133. The next prime is 1921159. The reversal of 1921145 is 5411291.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1921145 - 2⁸ = 1920889 is a prime.

It is a super-2 number, since 2×1921145² = 7381596222050, which contains 22 as substring.

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 1921145.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 254 + ... + 1976.

It is an arithmetic number, because the mean of its divisors is an integer number (289632).

2^1921145 is an apocalyptic number.

It is an amenable number.

1921145 is a deficient number, since it is larger than the sum of its proper divisors (395911).

1921145 is a wasteful number, since it uses less digits than its factorization.

1921145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1951.

The product of its digits is 360, while the sum is 23.

The square root of 1921145 is about 1386.0537507615. The cubic root of 1921145 is about 124.3140021425.

The spelling of 1921145 in words is "one million, nine hundred twenty-one thousand, one hundred forty-five".