840118997 has 2 divisors, whose sum is σ = 840118998. Its totient is φ = 840118996.

The previous prime is 840118973. The next prime is 840119041. The reversal of 840118997 is 799811048.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 833534641 + 6584356 = 28871^2 + 2566^2 .

It is a cyclic number.

It is not a de Polignac number, because 840118997 - 2¹² = 840114901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (840112997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420059498 + 420059499.

It is an arithmetic number, because the mean of its divisors is an integer number (420059499).

Almost surely, 2^840118997 is an apocalyptic number.

It is an amenable number.

840118997 is a deficient number, since it is larger than the sum of its proper divisors (1).

840118997 is an equidigital number, since it uses as much as digits as its factorization.

840118997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145152, while the sum is 47.

The square root of 840118997 is about 28984.8063129633. The cubic root of 840118997 is about 943.5833488350.

The spelling of 840118997 in words is "eight hundred forty million, one hundred eighteen thousand, nine hundred ninety-seven".