340406457 has 4 divisors (see below), whose sum is σ = 453875280. Its totient is φ = 226937636.

The previous prime is 340406389. The next prime is 340406471. The reversal of 340406457 is 754604043.

It is a happy number.

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 an emirpimes, since its reverse is a distinct semiprime: 754604043 = 3 ⋅251534681.

It is a cyclic number.

It is not a de Polignac number, because 340406457 - 2¹⁶ = 340340921 is a prime.

It is not an unprimeable number, because it can be changed into a prime (340406357) 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, 56734407 + ... + 56734412.

It is an arithmetic number, because the mean of its divisors is an integer number (113468820).

Almost surely, 2^340406457 is an apocalyptic number.

It is an amenable number.

340406457 is a deficient number, since it is larger than the sum of its proper divisors (113468823).

340406457 is a wasteful number, since it uses less digits than its factorization.

340406457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113468822.

The product of its (nonzero) digits is 40320, while the sum is 33.

The square root of 340406457 is about 18450.1072354607. The cubic root of 340406457 is about 698.2312193916.

The spelling of 340406457 in words is "three hundred forty million, four hundred six thousand, four hundred fifty-seven".