1616789 has 6 divisors (see below), whose sum is σ = 1663074. Its totient is φ = 1571760.

The previous prime is 1616749. The next prime is 1616801. The reversal of 1616789 is 9876161.

It can be written as a sum of positive squares in 3 ways, for example, as 1276900 + 339889 = 1130^2 + 583^2 .

It is not a de Polignac number, because 1616789 - 2⁸ = 1616533 is a prime.

It is a super-2 number, since 2×1616789² = 5228013341042, which contains 22 as substring.

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 (1616749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 779 + ... + 1959.

It is an arithmetic number, because the mean of its divisors is an integer number (277179).

2^1616789 is an apocalyptic number.

It is an amenable number.

1616789 is a deficient number, since it is larger than the sum of its proper divisors (46285).

1616789 is an equidigital number, since it uses as much as digits as its factorization.

1616789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1255 (or 1218 counting only the distinct ones).

The product of its digits is 18144, while the sum is 38.

The square root of 1616789 is about 1271.5301805305. The cubic root of 1616789 is about 117.3683813673.

The spelling of 1616789 in words is "one million, six hundred sixteen thousand, seven hundred eighty-nine".