1205915 has 4 divisors (see below), whose sum is σ = 1447104. Its totient is φ = 964728.

The previous prime is 1205903. The next prime is 1205921. The reversal of 1205915 is 5195021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5195021 = 13 ⋅399617.

It is a cyclic number.

It is not a de Polignac number, because 1205915 - 2⁴ = 1205899 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14 and base 16.

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 in 3 ways as a sum of consecutive naturals, for example, 120587 + ... + 120596.

It is an arithmetic number, because the mean of its divisors is an integer number (361776).

2^1205915 is an apocalyptic number.

1205915 is a deficient number, since it is larger than the sum of its proper divisors (241189).

1205915 is an equidigital number, since it uses as much as digits as its factorization.

1205915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241188.

The product of its (nonzero) digits is 450, while the sum is 23.

The square root of 1205915 is about 1098.1416119973. The cubic root of 1205915 is about 106.4401715292.

The spelling of 1205915 in words is "one million, two hundred five thousand, nine hundred fifteen".