1815122 has 4 divisors (see below), whose sum is σ = 2722686. Its totient is φ = 907560.

The previous prime is 1815103. The next prime is 1815131. The reversal of 1815122 is 2215181.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1792921 + 22201 = 1339^2 + 149^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1815094 and 1815103.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 453779 + ... + 453782.

2^1815122 is an apocalyptic number.

1815122 is a deficient number, since it is larger than the sum of its proper divisors (907564).

1815122 is an equidigital number, since it uses as much as digits as its factorization.

1815122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 907563.

The product of its digits is 160, while the sum is 20.

The square root of 1815122 is about 1347.2646362167. The cubic root of 1815122 is about 121.9837387625.

The spelling of 1815122 in words is "one million, eight hundred fifteen thousand, one hundred twenty-two".