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1664387 is a prime number
BaseRepresentation
bin110010110010110000011
310010120002222
412112112003
5411230022
655401255
720101304
oct6262603
93116088
101664387
11a3752a
1268322b
1346375a
143147ab
1522d242
hex196583

1664387 has 2 divisors, whose sum is σ = 1664388. Its totient is φ = 1664386.

The previous prime is 1664353. The next prime is 1664407. The reversal of 1664387 is 7834661.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-1664387 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1664287) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 832193 + 832194.

It is an arithmetic number, because the mean of its divisors is an integer number (832194).

21664387 is an apocalyptic number.

1664387 is a deficient number, since it is larger than the sum of its proper divisors (1).

1664387 is an equidigital number, since it uses as much as digits as its factorization.

1664387 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 35.

The square root of 1664387 is about 1290.1112355142. Note that the first 3 decimals coincide. The cubic root of 1664387 is about 118.5090286106.

The spelling of 1664387 in words is "one million, six hundred sixty-four thousand, three hundred eighty-seven".