1921825 has 6 divisors (see below), whose sum is σ = 2383094. Its totient is φ = 1537440.

The previous prime is 1921823. The next prime is 1921841. The reversal of 1921825 is 5281291.

It can be written as a sum of positive squares in 3 ways, for example, as 613089 + 1308736 = 783^2 + 1144^2 .

It is not a de Polignac number, because 1921825 - 2¹ = 1921823 is a prime.

It is a super-2 number, since 2×1921825² = 7386822661250, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1921793 and 1921802.

It is not an unprimeable number, because it can be changed into a prime (1921823) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 38412 + ... + 38461.

2^1921825 is an apocalyptic number.

It is an amenable number.

1921825 is a deficient number, since it is larger than the sum of its proper divisors (461269).

1921825 is an equidigital number, since it uses as much as digits as its factorization.

1921825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76883 (or 76878 counting only the distinct ones).

The product of its digits is 1440, while the sum is 28.

The square root of 1921825 is about 1386.2990297912. The cubic root of 1921825 is about 124.3286676240.

The spelling of 1921825 in words is "one million, nine hundred twenty-one thousand, eight hundred twenty-five".