340256731 has 4 divisors (see below), whose sum is σ = 358165000. Its totient is φ = 322348464.

The previous prime is 340256671. The next prime is 340256737. The reversal of 340256731 is 137652043.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 340256731 - 2⁹ = 340256219 is a prime.

It is a super-2 number, since 2×340256731² = 231549285981612722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 340256693 and 340256702.

It is not an unprimeable number, because it can be changed into a prime (340256737) 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, 8954106 + ... + 8954143.

It is an arithmetic number, because the mean of its divisors is an integer number (89541250).

Almost surely, 2^340256731 is an apocalyptic number.

340256731 is a deficient number, since it is larger than the sum of its proper divisors (17908269).

340256731 is a wasteful number, since it uses less digits than its factorization.

340256731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17908268.

The product of its (nonzero) digits is 15120, while the sum is 31.

The square root of 340256731 is about 18446.0491975924. The cubic root of 340256731 is about 698.1288332619.

The spelling of 340256731 in words is "three hundred forty million, two hundred fifty-six thousand, seven hundred thirty-one".