340495391 has 4 divisors (see below), whose sum is σ = 342223992. Its totient is φ = 338766792.

The previous prime is 340495369. The next prime is 340495403. The reversal of 340495391 is 193594043.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 193594043 = 2837 ⋅68239.

It is a cyclic number.

It is not a de Polignac number, because 340495391 - 2²² = 336301087 is a prime.

It is a super-2 number, since 2×340495391² = 231874222584485762, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (340495321) 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, 864005 + ... + 864398.

It is an arithmetic number, because the mean of its divisors is an integer number (85555998).

Almost surely, 2^340495391 is an apocalyptic number.

340495391 is a deficient number, since it is larger than the sum of its proper divisors (1728601).

340495391 is a wasteful number, since it uses less digits than its factorization.

340495391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1728600.

The product of its (nonzero) digits is 58320, while the sum is 38.

The square root of 340495391 is about 18452.5171995584. The cubic root of 340495391 is about 698.2920203224.

The spelling of 340495391 in words is "three hundred forty million, four hundred ninety-five thousand, three hundred ninety-one".