340387257 has 8 divisors (see below), whose sum is σ = 518685376. Its totient is φ = 194506992.

The previous prime is 340387237. The next prime is 340387273. The reversal of 340387257 is 752783043.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 340387257 - 2⁶ = 340387193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (340387217) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8104438 + ... + 8104479.

It is an arithmetic number, because the mean of its divisors is an integer number (64835672).

Almost surely, 2^340387257 is an apocalyptic number.

It is an amenable number.

340387257 is a deficient number, since it is larger than the sum of its proper divisors (178298119).

340387257 is a wasteful number, since it uses less digits than its factorization.

340387257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16208927.

The product of its (nonzero) digits is 141120, while the sum is 39.

The square root of 340387257 is about 18449.5869059445. The cubic root of 340387257 is about 698.2180916623.

The spelling of 340387257 in words is "three hundred forty million, three hundred eighty-seven thousand, two hundred fifty-seven".