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1990657 is a prime number
BaseRepresentation
bin111100110000000000001
310202010200001
413212000001
51002200112
6110400001
722630444
oct7460001
93663601
101990657
11113a679
12800001
13549106
1439b65b
15294c57
hex1e6001

1990657 has 2 divisors, whose sum is σ = 1990658. Its totient is φ = 1990656.

The previous prime is 1990643. The next prime is 1990661. The reversal of 1990657 is 7560991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1324801 + 665856 = 1151^2 + 816^2 .

It is a cyclic number.

It is not a de Polignac number, because 1990657 - 27 = 1990529 is a prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (1990607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a Pierpont prime, being equal to 213 ⋅ 35 + 1.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 995328 + 995329.

It is an arithmetic number, because the mean of its divisors is an integer number (995329).

It is a Proth number, since it is equal to 243 ⋅ 213 + 1 and 243 < 213.

21990657 is an apocalyptic number.

It is an amenable number.

1990657 is a deficient number, since it is larger than the sum of its proper divisors (1).

1990657 is an equidigital number, since it uses as much as digits as its factorization.

1990657 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17010, while the sum is 37.

The square root of 1990657 is about 1410.9064462253. The cubic root of 1990657 is about 125.7956079864.

The spelling of 1990657 in words is "one million, nine hundred ninety thousand, six hundred fifty-seven".