840943457 has 8 divisors (see below), whose sum is σ = 879040896. Its totient is φ = 802973952.

The previous prime is 840943447. The next prime is 840943463. The reversal of 840943457 is 754349048.

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 840943457 - 2²² = 836749153 is a prime.

It is a super-2 number, since 2×840943457² = 1414371795742221698, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (840943447) 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, 18413 + ... + 44954.

It is an arithmetic number, because the mean of its divisors is an integer number (109880112).

Almost surely, 2^840943457 is an apocalyptic number.

It is an amenable number.

840943457 is a deficient number, since it is larger than the sum of its proper divisors (38097439).

840943457 is a wasteful number, since it uses less digits than its factorization.

840943457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63967.

The product of its (nonzero) digits is 483840, while the sum is 44.

The square root of 840943457 is about 28999.0251043031. The cubic root of 840943457 is about 943.8919132118.

The spelling of 840943457 in words is "eight hundred forty million, nine hundred forty-three thousand, four hundred fifty-seven".