1229815 has 4 divisors (see below), whose sum is σ = 1475784. Its totient is φ = 983848.

The previous prime is 1229807. The next prime is 1229827. The reversal of 1229815 is 5189221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5189221 = 307 ⋅16903.

It is a cyclic number.

It is not a de Polignac number, because 1229815 - 2³ = 1229807 is a prime.

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 3 ways as a sum of consecutive naturals, for example, 122977 + ... + 122986.

It is an arithmetic number, because the mean of its divisors is an integer number (368946).

2^1229815 is an apocalyptic number.

1229815 is a deficient number, since it is larger than the sum of its proper divisors (245969).

1229815 is an equidigital number, since it uses as much as digits as its factorization.

1229815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245968.

The product of its digits is 1440, while the sum is 28.

The square root of 1229815 is about 1108.9702430634. The cubic root of 1229815 is about 107.1387549752.

The spelling of 1229815 in words is "one million, two hundred twenty-nine thousand, eight hundred fifteen".