1840640671 has 12 divisors (see below), whose sum is σ = 1908446880. Its totient is φ = 1774936800.

The previous prime is 1840640653. The next prime is 1840640687. The reversal of 1840640671 is 1760460481.

It is a happy number.

It is not a de Polignac number, because 1840640671 - 2²³ = 1832252063 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1840640671.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1840640171) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 139771 + ... + 152371.

It is an arithmetic number, because the mean of its divisors is an integer number (159037240).

Almost surely, 2^1840640671 is an apocalyptic number.

1840640671 is a deficient number, since it is larger than the sum of its proper divisors (67806209).

1840640671 is an equidigital number, since it uses as much as digits as its factorization.

1840640671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12766 (or 12723 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 37.

The square root of 1840640671 is about 42902.6883889576. The cubic root of 1840640671 is about 1225.5273411362.

The spelling of 1840640671 in words is "one billion, eight hundred forty million, six hundred forty thousand, six hundred seventy-one".