1220733 has 6 divisors (see below), whose sum is σ = 1763294. Its totient is φ = 813816.

The previous prime is 1220729. The next prime is 1220743. The reversal of 1220733 is 3370221.

It can be written as a sum of positive squares in only one way, i.e., 1205604 + 15129 = 1098^2 + 123^2 .

It is not a de Polignac number, because 1220733 - 2² = 1220729 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220743) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 67810 + ... + 67827.

2^1220733 is an apocalyptic number.

It is an amenable number.

1220733 is a deficient number, since it is larger than the sum of its proper divisors (542561).

1220733 is a wasteful number, since it uses less digits than its factorization.

1220733 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135643 (or 135640 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 18.

The square root of 1220733 is about 1104.8678654029. The cubic root of 1220733 is about 106.8743685199.

Adding to 1220733 its reverse (3370221), we get a palindrome (4590954).

It can be divided in two parts, 1220 and 733, that added together give a triangular number (1953 = T₆₂).

The spelling of 1220733 in words is "one million, two hundred twenty thousand, seven hundred thirty-three".