210428929 has 4 divisors (see below), whose sum is σ = 210742276. Its totient is φ = 210115584.

The previous prime is 210428893. The next prime is 210428963. The reversal of 210428929 is 929824012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 63170704 + 147258225 = 7948^2 + 12135^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210428929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216428929) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 155664 + ... + 157009.

It is an arithmetic number, because the mean of its divisors is an integer number (52685569).

Almost surely, 2^210428929 is an apocalyptic number.

It is an amenable number.

210428929 is a deficient number, since it is larger than the sum of its proper divisors (313347).

210428929 is an equidigital number, since it uses as much as digits as its factorization.

210428929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313346.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 210428929 is about 14506.1686533695. The cubic root of 210428929 is about 594.7966058559.

The spelling of 210428929 in words is "two hundred ten million, four hundred twenty-eight thousand, nine hundred twenty-nine".