840631761 has 12 divisors (see below), whose sum is σ = 1267039488. Its totient is φ = 536054904.

The previous prime is 840631711. The next prime is 840631777. The reversal of 840631761 is 167136048.

It is a de Polignac number, because none of the positive numbers 2^k-840631761 is a prime.

It is a super-2 number, since 2×840631761² = 1413323515203922242, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (840631711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2030305 + ... + 2030718.

It is an arithmetic number, because the mean of its divisors is an integer number (105586624).

Almost surely, 2^840631761 is an apocalyptic number.

It is an amenable number.

840631761 is a deficient number, since it is larger than the sum of its proper divisors (426407727).

840631761 is a wasteful number, since it uses less digits than its factorization.

840631761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4061052 (or 4061049 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 840631761 is about 28993.6503565867. The cubic root of 840631761 is about 943.7752808397.

The spelling of 840631761 in words is "eight hundred forty million, six hundred thirty-one thousand, seven hundred sixty-one".