1825815 has 8 divisors (see below), whose sum is σ = 2921328. Its totient is φ = 973760.

The previous prime is 1825787. The next prime is 1825819. The reversal of 1825815 is 5185281.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1825815 - 2⁷ = 1825687 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1825819) 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 7 ways as a sum of consecutive naturals, for example, 60846 + ... + 60875.

It is an arithmetic number, because the mean of its divisors is an integer number (365166).

2^1825815 is an apocalyptic number.

1825815 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1825815 is a deficient number, since it is larger than the sum of its proper divisors (1095513).

1825815 is a wasteful number, since it uses less digits than its factorization.

1825815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121729.

The product of its digits is 3200, while the sum is 30.

The square root of 1825815 is about 1351.2272199745. The cubic root of 1825815 is about 122.2228079250. Note that the first 3 decimals are identical.

The spelling of 1825815 in words is "one million, eight hundred twenty-five thousand, eight hundred fifteen".