1640012043 has 8 divisors (see below), whose sum is σ = 2208333456. Its totient is φ = 1082516000.

The previous prime is 1640012039. The next prime is 1640012047. The reversal of 1640012043 is 3402100461.

It is an interprime number because it is at equal distance from previous prime (1640012039) and next prime (1640012047).

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 1640012043 - 2² = 1640012039 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1640012047) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2705988 + ... + 2706593.

It is an arithmetic number, because the mean of its divisors is an integer number (276041682).

Almost surely, 2^1640012043 is an apocalyptic number.

1640012043 is a deficient number, since it is larger than the sum of its proper divisors (568321413).

1640012043 is a wasteful number, since it uses less digits than its factorization.

1640012043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5412685.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 1640012043 is about 40497.0621527044. The cubic root of 1640012043 is about 1179.2765945710.

The spelling of 1640012043 in words is "one billion, six hundred forty million, twelve thousand, forty-three".