1640273 has 2 divisors, whose sum is σ = 1640274. Its totient is φ = 1640272.

The previous prime is 1640267. The next prime is 1640281. The reversal of 1640273 is 3720461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1555009 + 85264 = 1247^2 + 292^2 .

It is a cyclic number.

It is not a de Polignac number, because 1640273 - 2⁸ = 1640017 is a prime.

It is equal to p₁₂₃₉₆₂ and since 1640273 and 123962 have the same sum of digits, it is a Honaker prime.

It is a plaindrome in base 13.

It is not a weakly prime, because it can be changed into another prime (1640263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820136 + 820137.

It is an arithmetic number, because the mean of its divisors is an integer number (820137).

2^1640273 is an apocalyptic number.

It is an amenable number.

1640273 is a deficient number, since it is larger than the sum of its proper divisors (1).

1640273 is an equidigital number, since it uses as much as digits as its factorization.

1640273 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 1640273 is about 1280.7314316437. The cubic root of 1640273 is about 117.9339139673.

The spelling of 1640273 in words is "one million, six hundred forty thousand, two hundred seventy-three".