1921945 has 8 divisors (see below), whose sum is σ = 2427840. Its totient is φ = 1456560.

The previous prime is 1921937. The next prime is 1921967. The reversal of 1921945 is 5491291.

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

It is not a de Polignac number, because 1921945 - 2³ = 1921937 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10021 + ... + 10210.

It is an arithmetic number, because the mean of its divisors is an integer number (303480).

2^1921945 is an apocalyptic number.

It is an amenable number.

1921945 is a deficient number, since it is larger than the sum of its proper divisors (505895).

1921945 is a wasteful number, since it uses less digits than its factorization.

1921945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20255.

The product of its digits is 3240, while the sum is 31.

The square root of 1921945 is about 1386.3423098211. The cubic root of 1921945 is about 124.3312552911.

The spelling of 1921945 in words is "one million, nine hundred twenty-one thousand, nine hundred forty-five".