1891825 has 12 divisors (see below), whose sum is σ = 2526748. Its totient is φ = 1396800.

The previous prime is 1891807. The next prime is 1891829. The reversal of 1891825 is 5281981.

It can be written as a sum of positive squares in 6 ways, for example, as 31329 + 1860496 = 177^2 + 1364^2 .

It is not a de Polignac number, because 1891825 - 2¹⁵ = 1859057 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1891829) 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, 2586 + ... + 3235.

2^1891825 is an apocalyptic number.

It is an amenable number.

1891825 is a deficient number, since it is larger than the sum of its proper divisors (634923).

1891825 is a wasteful number, since it uses less digits than its factorization.

1891825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5844 (or 5839 counting only the distinct ones).

The product of its digits is 5760, while the sum is 34.

The square root of 1891825 is about 1375.4362944172. The cubic root of 1891825 is about 123.6783416719.

The spelling of 1891825 in words is "one million, eight hundred ninety-one thousand, eight hundred twenty-five".