820490929 has 2 divisors, whose sum is σ = 820490930. Its totient is φ = 820490928.

The previous prime is 820490921. The next prime is 820490971. The reversal of 820490929 is 929094028.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 683717904 + 136773025 = 26148^2 + 11695^2 .

It is a cyclic number.

It is not a de Polignac number, because 820490929 - 2³ = 820490921 is a prime.

It is not a weakly prime, because it can be changed into another prime (820490921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410245464 + 410245465.

It is an arithmetic number, because the mean of its divisors is an integer number (410245465).

Almost surely, 2^820490929 is an apocalyptic number.

It is an amenable number.

820490929 is a deficient number, since it is larger than the sum of its proper divisors (1).

820490929 is an equidigital number, since it uses as much as digits as its factorization.

820490929 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 93312, while the sum is 43.

The square root of 820490929 is about 28644.2128361036. The cubic root of 820490929 is about 936.1769155840.

The spelling of 820490929 in words is "eight hundred twenty million, four hundred ninety thousand, nine hundred twenty-nine".