3216789 has 6 divisors (see below), whose sum is σ = 4646486. Its totient is φ = 2144520.

The previous prime is 3216781. The next prime is 3216799. The reversal of 3216789 is 9876123.

It can be written as a sum of positive squares in only one way, i.e., 2480625 + 736164 = 1575^2 + 858^2 .

It is not a de Polignac number, because 3216789 - 2³ = 3216781 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3216781) 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, 178702 + ... + 178719.

Almost surely, 2^3216789 is an apocalyptic number.

It is an amenable number.

3216789 is a deficient number, since it is larger than the sum of its proper divisors (1429697).

3216789 is a wasteful number, since it uses less digits than its factorization.

3216789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357427 (or 357424 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 3216789 is about 1793.5409111587. The cubic root of 3216789 is about 147.6185239051.

It can be divided in two parts, 3216 and 789, that added together give a triangular number (4005 = T₈₉).

The spelling of 3216789 in words is "three million, two hundred sixteen thousand, seven hundred eighty-nine".