990040693 has 2 divisors, whose sum is σ = 990040694. Its totient is φ = 990040692.

The previous prime is 990040661. The next prime is 990040697. The reversal of 990040693 is 396040099.

990040693 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 547653604 + 442387089 = 23402^2 + 21033^2 .

It is a cyclic number.

It is not a de Polignac number, because 990040693 - 2⁵ = 990040661 is a prime.

It is equal to p_50366677 and since 990040693 and 50366677 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (990040697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495020346 + 495020347.

It is an arithmetic number, because the mean of its divisors is an integer number (495020347).

Almost surely, 2^990040693 is an apocalyptic number.

It is an amenable number.

990040693 is a deficient number, since it is larger than the sum of its proper divisors (1).

990040693 is an equidigital number, since it uses as much as digits as its factorization.

990040693 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 52488, while the sum is 40.

The square root of 990040693 is about 31464.9120926787. The cubic root of 990040693 is about 996.6691487481.

The spelling of 990040693 in words is "nine hundred ninety million, forty thousand, six hundred ninety-three".