340191857 has 4 divisors (see below), whose sum is σ = 340229616. Its totient is φ = 340154100.

The previous prime is 340191833. The next prime is 340191869. The reversal of 340191857 is 758191043.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 758191043 = 193 ⋅3928451.

It is a cyclic number.

It is not a de Polignac number, because 340191857 - 2²⁰ = 339143281 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 340191857.

It is not an unprimeable number, because it can be changed into a prime (340191557) 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, 3398 + ... + 26304.

It is an arithmetic number, because the mean of its divisors is an integer number (85057404).

Almost surely, 2^340191857 is an apocalyptic number.

It is an amenable number.

340191857 is a deficient number, since it is larger than the sum of its proper divisors (37759).

340191857 is a wasteful number, since it uses less digits than its factorization.

340191857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37758.

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 340191857 is about 18444.2906342315. The cubic root of 340191857 is about 698.0844615817.

The spelling of 340191857 in words is "three hundred forty million, one hundred ninety-one thousand, eight hundred fifty-seven".