1945021 has 12 divisors (see below), whose sum is σ = 2233332. Its totient is φ = 1687296.

The previous prime is 1945007. The next prime is 1945043. The reversal of 1945021 is 1205491.

It can be written as a sum of positive squares in 6 ways, for example, as 24025 + 1920996 = 155^2 + 1386^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1945021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1944983 and 1945001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1945051) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2535 + ... + 3211.

It is an arithmetic number, because the mean of its divisors is an integer number (186111).

2^1945021 is an apocalyptic number.

It is an amenable number.

1945021 is a deficient number, since it is larger than the sum of its proper divisors (288311).

1945021 is a wasteful number, since it uses less digits than its factorization.

1945021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 720 (or 707 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 1945021 is about 1394.6400969426. The cubic root of 1945021 is about 124.8268749992.

The spelling of 1945021 in words is "one million, nine hundred forty-five thousand, twenty-one".