234991857 has 4 divisors (see below), whose sum is σ = 313322480. Its totient is φ = 156661236.

The previous prime is 234991849. The next prime is 234991859. The reversal of 234991857 is 758199432.

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 234991857 - 2³ = 234991849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (234991859) 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, 39165307 + ... + 39165312.

It is an arithmetic number, because the mean of its divisors is an integer number (78330620).

Almost surely, 2^234991857 is an apocalyptic number.

It is an amenable number.

234991857 is a deficient number, since it is larger than the sum of its proper divisors (78330623).

234991857 is an equidigital number, since it uses as much as digits as its factorization.

234991857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78330622.

The product of its digits is 544320, while the sum is 48.

The square root of 234991857 is about 15329.4441190801. Note that the first 3 decimals coincide. The cubic root of 234991857 is about 617.0934514648.

The spelling of 234991857 in words is "two hundred thirty-four million, nine hundred ninety-one thousand, eight hundred fifty-seven".