1640031 has 4 divisors (see below), whose sum is σ = 2186712. Its totient is φ = 1093352.

The previous prime is 1640021. The next prime is 1640033. The reversal of 1640031 is 1300461.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1640031 - 2⁵ = 1639999 is a prime.

It is a super-2 number, since 2×1640031² = 5379403361922, which contains 22 as substring.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640033) 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 3 ways as a sum of consecutive naturals, for example, 273336 + ... + 273341.

It is an arithmetic number, because the mean of its divisors is an integer number (546678).

2^1640031 is an apocalyptic number.

1640031 is a deficient number, since it is larger than the sum of its proper divisors (546681).

1640031 is an equidigital number, since it uses as much as digits as its factorization.

1640031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 546680.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 1640031 is about 1280.6369508959. The cubic root of 1640031 is about 117.9281138330.

Adding to 1640031 its reverse (1300461), we get a palindrome (2940492).

The spelling of 1640031 in words is "one million, six hundred forty thousand, thirty-one".