1220447 has 12 divisors (see below), whose sum is σ = 1340976. Its totient is φ = 1109760.

The previous prime is 1220437. The next prime is 1220489. The reversal of 1220447 is 7440221.

It is not a de Polignac number, because 1220447 - 2¹² = 1216351 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220437) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11798 + ... + 11900.

It is an arithmetic number, because the mean of its divisors is an integer number (111748).

2^1220447 is an apocalyptic number.

1220447 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

1220447 is a deficient number, since it is larger than the sum of its proper divisors (120529).

1220447 is a wasteful number, since it uses less digits than its factorization.

1220447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178 (or 161 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 20.

The square root of 1220447 is about 1104.7384305798. The cubic root of 1220447 is about 106.8660214976.

Adding to 1220447 its reverse (7440221), we get a palindrome (8660668).

The spelling of 1220447 in words is "one million, two hundred twenty thousand, four hundred forty-seven".