1220955 has 16 divisors (see below), whose sum is σ = 2039040. Its totient is φ = 622688.

The previous prime is 1220953. The next prime is 1220969. The reversal of 1220955 is 5590221.

It is a cyclic number.

It is not a de Polignac number, because 1220955 - 2¹ = 1220953 is a prime.

It is a super-2 number, since 2×1220955² = 2981462224050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1220953) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1425 + ... + 2114.

It is an arithmetic number, because the mean of its divisors is an integer number (127440).

2^1220955 is an apocalyptic number.

1220955 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1220955 is a deficient number, since it is larger than the sum of its proper divisors (818085).

1220955 is a wasteful number, since it uses less digits than its factorization.

1220955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3570.

The product of its (nonzero) digits is 900, while the sum is 24.

The square root of 1220955 is about 1104.9683253379. The cubic root of 1220955 is about 106.8808467784.

The spelling of 1220955 in words is "one million, two hundred twenty thousand, nine hundred fifty-five".