210869393 has 6 divisors (see below), whose sum is σ = 245297106. Its totient is φ = 180745152.

The previous prime is 210869381. The next prime is 210869423. The reversal of 210869393 is 393968012.

It can be written as a sum of positive squares in only one way, i.e., 171531409 + 39337984 = 13097^2 + 6272^2 .

It is not a de Polignac number, because 210869393 - 2¹⁴ = 210853009 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 210869393.

It is not an unprimeable number, because it can be changed into a prime (210869303) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2151680 + ... + 2151777.

It is an arithmetic number, because the mean of its divisors is an integer number (40882851).

Almost surely, 2^210869393 is an apocalyptic number.

It is an amenable number.

210869393 is a deficient number, since it is larger than the sum of its proper divisors (34427713).

210869393 is an equidigital number, since it uses as much as digits as its factorization.

210869393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4303471 (or 4303464 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 41.

The square root of 210869393 is about 14521.3426720810. The cubic root of 210869393 is about 595.2113205555.

The spelling of 210869393 in words is "two hundred ten million, eight hundred sixty-nine thousand, three hundred ninety-three".