209978853 has 16 divisors (see below), whose sum is σ = 320171520. Its totient is φ = 119911536.

The previous prime is 209978843. The next prime is 209978863. The reversal of 209978853 is 358879902.

It is an interprime number because it is at equal distance from previous prime (209978843) and next prime (209978863).

It is not a de Polignac number, because 209978853 - 2⁴ = 209978837 is a prime.

It is a super-2 number, since 2×209978853² = 88182237414391218, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 209978796 and 209978805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209978843) 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 in 15 ways as a sum of consecutive naturals, for example, 57426 + ... + 60972.

It is an arithmetic number, because the mean of its divisors is an integer number (20010720).

Almost surely, 2^209978853 is an apocalyptic number.

It is an amenable number.

209978853 is a deficient number, since it is larger than the sum of its proper divisors (110192667).

209978853 is a wasteful number, since it uses less digits than its factorization.

209978853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6376.

The product of its (nonzero) digits is 1088640, while the sum is 51.

The square root of 209978853 is about 14490.6470870006. The cubic root of 209978853 is about 594.3722428419.

The spelling of 209978853 in words is "two hundred nine million, nine hundred seventy-eight thousand, eight hundred fifty-three".