1667329 has 2 divisors, whose sum is σ = 1667330. Its totient is φ = 1667328.

The previous prime is 1667321. The next prime is 1667353. The reversal of 1667329 is 9237661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1488400 + 178929 = 1220^2 + 423^2 .

It is an emirp because it is prime and its reverse (9237661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1667329 - 2³ = 1667321 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1667294 and 1667303.

It is not a weakly prime, because it can be changed into another prime (1667321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 833664 + 833665.

It is an arithmetic number, because the mean of its divisors is an integer number (833665).

2^1667329 is an apocalyptic number.

It is an amenable number.

1667329 is a deficient number, since it is larger than the sum of its proper divisors (1).

1667329 is an equidigital number, since it uses as much as digits as its factorization.

1667329 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13608, while the sum is 34.

The square root of 1667329 is about 1291.2509438525. The cubic root of 1667329 is about 118.5788137296.

The spelling of 1667329 in words is "one million, six hundred sixty-seven thousand, three hundred twenty-nine".