1921801 has 8 divisors (see below), whose sum is σ = 2272320. Its totient is φ = 1590288.

The previous prime is 1921789. The next prime is 1921813. The reversal of 1921801 is 1081291.

1921801 = T₂₃ + T₂₄ + ... + T₂₂₅.

It is an interprime number because it is at equal distance from previous prime (1921789) and next prime (1921813).

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

It is not a de Polignac number, because 1921801 - 2⁵ = 1921769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1921841) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4531 + ... + 4936.

It is an arithmetic number, because the mean of its divisors is an integer number (284040).

2^1921801 is an apocalyptic number.

It is an amenable number.

1921801 is a deficient number, since it is larger than the sum of its proper divisors (350519).

1921801 is an equidigital number, since it uses as much as digits as its factorization.

1921801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9503.

The product of its (nonzero) digits is 144, while the sum is 22.

The square root of 1921801 is about 1386.2903736231. The cubic root of 1921801 is about 124.3281500777.

The spelling of 1921801 in words is "one million, nine hundred twenty-one thousand, eight hundred one".