209457893 has 4 divisors (see below), whose sum is σ = 209784288. Its totient is φ = 209131500.

The previous prime is 209457877. The next prime is 209457907. The reversal of 209457893 is 398754902.

It is a happy number.

209457893 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 a cyclic number.

It is not a de Polignac number, because 209457893 - 2⁴ = 209457877 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 (209457863) 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, 162233 + ... + 163518.

It is an arithmetic number, because the mean of its divisors is an integer number (52446072).

Almost surely, 2^209457893 is an apocalyptic number.

It is an amenable number.

209457893 is a deficient number, since it is larger than the sum of its proper divisors (326395).

209457893 is an equidigital number, since it uses as much as digits as its factorization.

209457893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326394.

The product of its (nonzero) digits is 544320, while the sum is 47.

The square root of 209457893 is about 14472.6601908564. The cubic root of 209457893 is about 593.8802875970.

The spelling of 209457893 in words is "two hundred nine million, four hundred fifty-seven thousand, eight hundred ninety-three".