840091057 has 32 divisors (see below), whose sum is σ = 978808320. Its totient is φ = 718398720.

The previous prime is 840091039. The next prime is 840091069. The reversal of 840091057 is 750190048.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-840091057 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840091027) 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 31 ways as a sum of consecutive naturals, for example, 3099832 + ... + 3100102.

It is an arithmetic number, because the mean of its divisors is an integer number (30587760).

Almost surely, 2^840091057 is an apocalyptic number.

It is an amenable number.

840091057 is a deficient number, since it is larger than the sum of its proper divisors (138717263).

840091057 is a wasteful number, since it uses less digits than its factorization.

840091057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410 (or 384 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 840091057 is about 28984.3243323007. The cubic root of 840091057 is about 943.5728884077.

The spelling of 840091057 in words is "eight hundred forty million, ninety-one thousand, fifty-seven".