840656953 has 8 divisors (see below), whose sum is σ = 890409888. Its totient is φ = 790937664.

The previous prime is 840656917. The next prime is 840656963. The reversal of 840656953 is 359656048.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-840656953 is a prime.

It is a super-2 number, since 2×840656953² = 1413408225254488418, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (840656963) 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, 58150 + ... + 71152.

It is an arithmetic number, because the mean of its divisors is an integer number (111301236).

Almost surely, 2^840656953 is an apocalyptic number.

It is an amenable number.

840656953 is a deficient number, since it is larger than the sum of its proper divisors (49752935).

840656953 is a wasteful number, since it uses less digits than its factorization.

840656953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16823.

The product of its (nonzero) digits is 777600, while the sum is 46.

The square root of 840656953 is about 28994.0847932815. The cubic root of 840656953 is about 943.7847084117.

The spelling of 840656953 in words is "eight hundred forty million, six hundred fifty-six thousand, nine hundred fifty-three".