1220578 has 4 divisors (see below), whose sum is σ = 1830870. Its totient is φ = 610288.

The previous prime is 1220507. The next prime is 1220591. The reversal of 1220578 is 8750221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8750221 = 401 ⋅21821.

It can be written as a sum of positive squares in only one way, i.e., 1216609 + 3969 = 1103^2 + 63^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305143 + ... + 305146.

2^1220578 is an apocalyptic number.

1220578 is a deficient number, since it is larger than the sum of its proper divisors (610292).

1220578 is an equidigital number, since it uses as much as digits as its factorization.

1220578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610291.

The product of its (nonzero) digits is 1120, while the sum is 25.

The square root of 1220578 is about 1104.7977190418. The cubic root of 1220578 is about 106.8698449459.

Adding to 1220578 its reverse (8750221), we get a palindrome (9970799).

The spelling of 1220578 in words is "one million, two hundred twenty thousand, five hundred seventy-eight".