1985290493 has 2 divisors, whose sum is σ = 1985290494. Its totient is φ = 1985290492.

The previous prime is 1985290451. The next prime is 1985290501. The reversal of 1985290493 is 3940925891.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1147651129 + 837639364 = 33877^2 + 28942^2 .

It is a cyclic number.

It is not a de Polignac number, because 1985290493 - 2⁶ = 1985290429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1985290403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 992645246 + 992645247.

It is an arithmetic number, because the mean of its divisors is an integer number (992645247).

Almost surely, 2^1985290493 is an apocalyptic number.

It is an amenable number.

1985290493 is a deficient number, since it is larger than the sum of its proper divisors (1).

1985290493 is an equidigital number, since it uses as much as digits as its factorization.

1985290493 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 699840, while the sum is 50.

The square root of 1985290493 is about 44556.5987593308. The cubic root of 1985290493 is about 1256.8246434230.

The spelling of 1985290493 in words is "one billion, nine hundred eighty-five million, two hundred ninety thousand, four hundred ninety-three".