1221048 has 32 divisors (see below), whose sum is σ = 3392400. Its totient is φ = 406944.

The previous prime is 1221029. The next prime is 1221049. The reversal of 1221048 is 8401221.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 1221048.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221049) 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, 2611 + ... + 3042.

2^1221048 is an apocalyptic number.

1221048 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1221048 is an abundant number, since it is smaller than the sum of its proper divisors (2171352).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221048 is a wasteful number, since it uses less digits than its factorization.

1221048 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5668 (or 5658 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 1221048 is about 1105.0104071908. The cubic root of 1221048 is about 106.8835604100.

Adding to 1221048 its reverse (8401221), we get a palindrome (9622269).

The spelling of 1221048 in words is "one million, two hundred twenty-one thousand, forty-eight".