1640271 has 8 divisors (see below), whose sum is σ = 2194560. Its totient is φ = 1089752.

The previous prime is 1640267. The next prime is 1640273. The reversal of 1640271 is 1720461.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1640271 - 2² = 1640267 is a prime.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 316 + ... + 1838.

It is an arithmetic number, because the mean of its divisors is an integer number (274320).

2^1640271 is an apocalyptic number.

1640271 is a deficient number, since it is larger than the sum of its proper divisors (554289).

1640271 is a wasteful number, since it uses less digits than its factorization.

1640271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1885.

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 1640271 is about 1280.7306508396. The cubic root of 1640271 is about 117.9338660346.

The spelling of 1640271 in words is "one million, six hundred forty thousand, two hundred seventy-one".