640092043 has 2 divisors, whose sum is σ = 640092044. Its totient is φ = 640092042.

The previous prime is 640091993. The next prime is 640092067. The reversal of 640092043 is 340290046.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-640092043 is a prime.

It is not a weakly prime, because it can be changed into another prime (640092073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320046021 + 320046022.

It is an arithmetic number, because the mean of its divisors is an integer number (320046022).

Almost surely, 2^640092043 is an apocalyptic number.

640092043 is a deficient number, since it is larger than the sum of its proper divisors (1).

640092043 is an equidigital number, since it uses as much as digits as its factorization.

640092043 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 640092043 is about 25300.0403754619. The cubic root of 640092043 is about 861.8151866641.

The spelling of 640092043 in words is "six hundred forty million, ninety-two thousand, forty-three".