840668554 has 24 divisors (see below), whose sum is σ = 1387586340. Its totient is φ = 381701760.

The previous prime is 840668539. The next prime is 840668557. The reversal of 840668554 is 455866048.

It can be written as a sum of positive squares in 2 ways, for example, as 796086225 + 44582329 = 28215^2 + 6677^2 .

It is not an unprimeable number, because it can be changed into a prime (840668557) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 359172 + ... + 361504.

Almost surely, 2^840668554 is an apocalyptic number.

840668554 is a deficient number, since it is larger than the sum of its proper divisors (546917786).

840668554 is a wasteful number, since it uses less digits than its factorization.

840668554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3846 (or 3835 counting only the distinct ones).

The product of its (nonzero) digits is 921600, while the sum is 46.

The square root of 840668554 is about 28994.2848506391. The cubic root of 840668554 is about 943.7890497767.

The spelling of 840668554 in words is "eight hundred forty million, six hundred sixty-eight thousand, five hundred fifty-four".