840694729 has 8 divisors (see below), whose sum is σ = 1011362240. Its totient is φ = 682669296.

The previous prime is 840694721. The next prime is 840694733. The reversal of 840694729 is 927496048.

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

It is a cyclic number.

It is not a de Polignac number, because 840694729 - 2³ = 840694721 is a prime.

It is not an unprimeable number, because it can be changed into a prime (840694721) 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, 3160374 + ... + 3160639.

It is an arithmetic number, because the mean of its divisors is an integer number (126420280).

Almost surely, 2^840694729 is an apocalyptic number.

It is an amenable number.

840694729 is a deficient number, since it is larger than the sum of its proper divisors (170667511).

840694729 is a wasteful number, since it uses less digits than its factorization.

840694729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6321039.

The product of its (nonzero) digits is 870912, while the sum is 49.

The square root of 840694729 is about 28994.7362291848. The cubic root of 840694729 is about 943.7988449260.

The spelling of 840694729 in words is "eight hundred forty million, six hundred ninety-four thousand, seven hundred twenty-nine".