840628723 has 8 divisors (see below), whose sum is σ = 965315520. Its totient is φ = 723986280.

The previous prime is 840628709. The next prime is 840628727. The reversal of 840628723 is 327826048.

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 840628723 - 2⁹ = 840628211 is a prime.

It is a super-2 number, since 2×840628723² = 1413313299865221458, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (840628727) 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, 2010865 + ... + 2011282.

It is an arithmetic number, because the mean of its divisors is an integer number (120664440).

Almost surely, 2^840628723 is an apocalyptic number.

840628723 is a deficient number, since it is larger than the sum of its proper divisors (124686797).

840628723 is a wasteful number, since it uses less digits than its factorization.

840628723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4022177.

The product of its (nonzero) digits is 129024, while the sum is 40.

The square root of 840628723 is about 28993.5979657579. The cubic root of 840628723 is about 943.7741439198.

The spelling of 840628723 in words is "eight hundred forty million, six hundred twenty-eight thousand, seven hundred twenty-three".