1891925 has 24 divisors (see below), whose sum is σ = 2827200. Its totient is φ = 1226880.

The previous prime is 1891909. The next prime is 1891927. The reversal of 1891925 is 5291981.

1891925 = 263² + 264² + ... + 287².

It is not a de Polignac number, because 1891925 - 2⁴ = 1891909 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1891927) 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 23 ways as a sum of consecutive naturals, for example, 3041 + ... + 3609.

It is an arithmetic number, because the mean of its divisors is an integer number (117800).

2^1891925 is an apocalyptic number.

It is an amenable number.

1891925 is a deficient number, since it is larger than the sum of its proper divisors (935275).

1891925 is a wasteful number, since it uses less digits than its factorization.

1891925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 605 (or 600 counting only the distinct ones).

The product of its digits is 6480, while the sum is 35.

The square root of 1891925 is about 1375.4726460384. The cubic root of 1891925 is about 123.6805208052.

The spelling of 1891925 in words is "one million, eight hundred ninety-one thousand, nine hundred twenty-five".