1813925 has 18 divisors (see below), whose sum is σ = 2355318. Its totient is φ = 1385280.

The previous prime is 1813913. The next prime is 1813937. The reversal of 1813925 is 5293181.

It is an interprime number because it is at equal distance from previous prime (1813913) and next prime (1813937).

It can be written as a sum of positive squares in 9 ways, for example, as 2209 + 1811716 = 47^2 + 1346^2 .

It is not a de Polignac number, because 1813925 - 2¹⁴ = 1797541 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 17 ways as a sum of consecutive naturals, for example, 34199 + ... + 34251.

It is an arithmetic number, because the mean of its divisors is an integer number (130851).

2^1813925 is an apocalyptic number.

It is an amenable number.

1813925 is a deficient number, since it is larger than the sum of its proper divisors (541393).

1813925 is an equidigital number, since it uses as much as digits as its factorization.

1813925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137 (or 95 counting only the distinct ones).

The product of its digits is 2160, while the sum is 29.

The square root of 1813925 is about 1346.8203295169. The cubic root of 1813925 is about 121.9569184085.

It can be divided in two parts, 1813 and 925, that multiplied together give a square (1677025 = 1295²).

The spelling of 1813925 in words is "one million, eight hundred thirteen thousand, nine hundred twenty-five".