1921725 has 60 divisors (see below), whose sum is σ = 3886036. Its totient is φ = 933120.

The previous prime is 1921723. The next prime is 1921729. The reversal of 1921725 is 5271291.

It can be written as a sum of positive squares in 6 ways, for example, as 171396 + 1750329 = 414^2 + 1323^2 .

It is not a de Polignac number, because 1921725 - 2¹ = 1921723 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1921723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 26289 + ... + 26361.

2^1921725 is an apocalyptic number.

1921725 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1921725 is an abundant number, since it is smaller than the sum of its proper divisors (1964311).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1921725 is a wasteful number, since it uses less digits than its factorization.

1921725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108 (or 94 counting only the distinct ones).

The product of its digits is 1260, while the sum is 27.

The square root of 1921725 is about 1386.2629620674. The cubic root of 1921725 is about 124.3265111525.

The spelling of 1921725 in words is "one million, nine hundred twenty-one thousand, seven hundred twenty-five".