1220515 has 16 divisors (see below), whose sum is σ = 1578528. Its totient is φ = 902656.

The previous prime is 1220507. The next prime is 1220591. The reversal of 1220515 is 5150221.

It is a cyclic number.

It is not a de Polignac number, because 1220515 - 2³ = 1220507 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6969 + ... + 7141.

It is an arithmetic number, because the mean of its divisors is an integer number (98658).

2^1220515 is an apocalyptic number.

1220515 is a deficient number, since it is larger than the sum of its proper divisors (358013).

1220515 is a wasteful number, since it uses less digits than its factorization.

1220515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278.

The product of its (nonzero) digits is 100, while the sum is 16.

The square root of 1220515 is about 1104.7692066672. The cubic root of 1220515 is about 106.8680062225.

Adding to 1220515 its reverse (5150221), we get a palindrome (6370736).

The spelling of 1220515 in words is "one million, two hundred twenty thousand, five hundred fifteen".