1220915 has 8 divisors (see below), whose sum is σ = 1489488. Its totient is φ = 960480.

The previous prime is 1220903. The next prime is 1220917. The reversal of 1220915 is 5190221.

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

It is not a de Polignac number, because 1220915 - 2¹⁰ = 1219891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220917) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1697 + ... + 2306.

It is an arithmetic number, because the mean of its divisors is an integer number (186186).

2^1220915 is an apocalyptic number.

1220915 is a deficient number, since it is larger than the sum of its proper divisors (268573).

1220915 is an equidigital number, since it uses as much as digits as its factorization.

1220915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4069.

The product of its (nonzero) digits is 180, while the sum is 20.

The square root of 1220915 is about 1104.9502251233. The cubic root of 1220915 is about 106.8796795826.

The spelling of 1220915 in words is "one million, two hundred twenty thousand, nine hundred fifteen".