1220634 has 24 divisors (see below), whose sum is σ = 2800980. Its totient is φ = 382848.

The previous prime is 1220623. The next prime is 1220657. The reversal of 1220634 is 4360221.

It is a happy number.

1220634 is a `hidden beast` number, since 12 + 20 + 634 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1199025 + 21609 = 1095^2 + 147^2 .

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

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1689 + ... + 2300.

2^1220634 is an apocalyptic number.

1220634 is an abundant number, since it is smaller than the sum of its proper divisors (1580346).

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

1220634 is a wasteful number, since it uses less digits than its factorization.

1220634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4014 (or 4011 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 1220634 is about 1104.8230627571. The cubic root of 1220634 is about 106.8714793136.

Adding to 1220634 its reverse (4360221), we get a palindrome (5580855).

The spelling of 1220634 in words is "one million, two hundred twenty thousand, six hundred thirty-four".