840323857 has 8 divisors (see below), whose sum is σ = 859988736. Its totient is φ = 820733472.

The previous prime is 840323839. The next prime is 840323873. The reversal of 840323857 is 758323048.

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 840323857 - 2²⁷ = 706106129 is a prime.

It is a super-2 number, since 2×840323857² = 1412288369286712898, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (840323357) 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, 4533 + ... + 41245.

It is an arithmetic number, because the mean of its divisors is an integer number (107498592).

Almost surely, 2^840323857 is an apocalyptic number.

It is an amenable number.

840323857 is a deficient number, since it is larger than the sum of its proper divisors (19664879).

840323857 is a wasteful number, since it uses less digits than its factorization.

840323857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37247.

The product of its (nonzero) digits is 161280, while the sum is 40.

The square root of 840323857 is about 28988.3400180141. The cubic root of 840323857 is about 943.6600390720.

The spelling of 840323857 in words is "eight hundred forty million, three hundred twenty-three thousand, eight hundred fifty-seven".