1921365 has 12 divisors (see below), whose sum is σ = 3330444. Its totient is φ = 1024704.

The previous prime is 1921363. The next prime is 1921393. The reversal of 1921365 is 5631291.

It can be written as a sum of positive squares in 2 ways, for example, as 459684 + 1461681 = 678^2 + 1209^2 .

It is not a de Polignac number, because 1921365 - 2¹ = 1921363 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1921363) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 21304 + ... + 21393.

It is an arithmetic number, because the mean of its divisors is an integer number (277537).

2^1921365 is an apocalyptic number.

1921365 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1921365 is a deficient number, since it is larger than the sum of its proper divisors (1409079).

1921365 is a wasteful number, since it uses less digits than its factorization.

1921365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42708 (or 42705 counting only the distinct ones).

The product of its digits is 1620, while the sum is 27.

The square root of 1921365 is about 1386.1331104912. The cubic root of 1921365 is about 124.3187472357.

The spelling of 1921365 in words is "one million, nine hundred twenty-one thousand, three hundred sixty-five".