1220736 has 96 divisors (see below), whose sum is σ = 3757680. Its totient is φ = 348160.

The previous prime is 1220729. The next prime is 1220743. The reversal of 1220736 is 6370221.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1220729) and next prime (1220743).

It is a tau number, because it is divible by the number of its divisors (96).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 71800 + ... + 71816.

2^1220736 is an apocalyptic number.

1220736 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1220736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1878840).

1220736 is an abundant number, since it is smaller than the sum of its proper divisors (2536944).

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

1220736 is a wasteful number, since it uses less digits than its factorization.

1220736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62 (or 33 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 21.

The square root of 1220736 is about 1104.8692230305. The cubic root of 1220736 is about 106.8744560692.

Adding to 1220736 its reverse (6370221), we get a palindrome (7590957).

It can be divided in two parts, 12 and 20736, that multiplied together give a 5-th power (248832 = 12⁵).

The spelling of 1220736 in words is "one million, two hundred twenty thousand, seven hundred thirty-six".