989940929 has 2 divisors, whose sum is σ = 989940930. Its totient is φ = 989940928.

The previous prime is 989940901. The next prime is 989940961. The reversal of 989940929 is 929049989.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 941262400 + 48678529 = 30680^2 + 6977^2 .

It is a cyclic number.

It is not a de Polignac number, because 989940929 - 2¹² = 989936833 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (989940979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494970464 + 494970465.

It is an arithmetic number, because the mean of its divisors is an integer number (494970465).

Almost surely, 2^989940929 is an apocalyptic number.

It is an amenable number.

989940929 is a deficient number, since it is larger than the sum of its proper divisors (1).

989940929 is an equidigital number, since it uses as much as digits as its factorization.

989940929 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3779136, while the sum is 59.

The square root of 989940929 is about 31463.3267312915. The cubic root of 989940929 is about 996.6356703124.

The spelling of 989940929 in words is "nine hundred eighty-nine million, nine hundred forty thousand, nine hundred twenty-nine".