209888157 has 4 divisors (see below), whose sum is σ = 279850880. Its totient is φ = 139925436.

The previous prime is 209888131. The next prime is 209888177. The reversal of 209888157 is 751888902.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 209888157 - 2⁸ = 209887901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209888177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34981357 + ... + 34981362.

It is an arithmetic number, because the mean of its divisors is an integer number (69962720).

Almost surely, 2^209888157 is an apocalyptic number.

It is an amenable number.

209888157 is a deficient number, since it is larger than the sum of its proper divisors (69962723).

209888157 is an equidigital number, since it uses as much as digits as its factorization.

209888157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69962722.

The product of its (nonzero) digits is 322560, while the sum is 48.

The square root of 209888157 is about 14487.5172821295. The cubic root of 209888157 is about 594.2866549404.

The spelling of 209888157 in words is "two hundred nine million, eight hundred eighty-eight thousand, one hundred fifty-seven".