1220454 has 32 divisors (see below), whose sum is σ = 2751840. Its totient is φ = 400896.

The previous prime is 1220437. The next prime is 1220489. The reversal of 1220454 is 4540221.

It is a super-2 number, since 2×1220454² = 2979015932232, which contains 22 as substring.

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

It is a congruent 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, 5122 + ... + 5354.

It is an arithmetic number, because the mean of its divisors is an integer number (85995).

2^1220454 is an apocalyptic number.

1220454 is the 699-th heptagonal number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1220454, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1375920).

1220454 is an abundant number, since it is smaller than the sum of its proper divisors (1531386).

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

1220454 is a wasteful number, since it uses less digits than its factorization.

1220454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 341 (or 335 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 1220454 is about 1104.7415987461. The cubic root of 1220454 is about 106.8662258109.

Adding to 1220454 its reverse (4540221), we get a palindrome (5760675).

The spelling of 1220454 in words is "one million, two hundred twenty thousand, four hundred fifty-four".