1880729 has 2 divisors, whose sum is σ = 1880730. Its totient is φ = 1880728.

The previous prime is 1880707. The next prime is 1880741. The reversal of 1880729 is 9270881.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1630729 + 250000 = 1277^2 + 500^2 .

It is an emirp because it is prime and its reverse (9270881) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1880729 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1880789) 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 as a sum of consecutive naturals, namely, 940364 + 940365.

It is an arithmetic number, because the mean of its divisors is an integer number (940365).

2^1880729 is an apocalyptic number.

It is an amenable number.

1880729 is a deficient number, since it is larger than the sum of its proper divisors (1).

1880729 is an equidigital number, since it uses as much as digits as its factorization.

1880729 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064, while the sum is 35.

The square root of 1880729 is about 1371.3967332614. The cubic root of 1880729 is about 123.4360665005.

The spelling of 1880729 in words is "one million, eight hundred eighty thousand, seven hundred twenty-nine".