840729345 has 8 divisors (see below), whose sum is σ = 1345166976. Its totient is φ = 448388976.

The previous prime is 840729341. The next prime is 840729349. The reversal of 840729345 is 543927048.

It is an interprime number because it is at equal distance from previous prime (840729341) and next prime (840729349).

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

It is not a de Polignac number, because 840729345 - 2² = 840729341 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 840729297 and 840729306.

It is not an unprimeable number, because it can be changed into a prime (840729341) 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, 28024297 + ... + 28024326.

It is an arithmetic number, because the mean of its divisors is an integer number (168145872).

Almost surely, 2^840729345 is an apocalyptic number.

It is an amenable number.

840729345 is a deficient number, since it is larger than the sum of its proper divisors (504437631).

840729345 is a wasteful number, since it uses less digits than its factorization.

840729345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56048631.

The product of its (nonzero) digits is 241920, while the sum is 42.

The square root of 840729345 is about 28995.3331589758. Note that the first 3 decimals coincide. The cubic root of 840729345 is about 943.8117985350.

The spelling of 840729345 in words is "eight hundred forty million, seven hundred twenty-nine thousand, three hundred forty-five".