1640214187 has 2 divisors, whose sum is σ = 1640214188. Its totient is φ = 1640214186.

The previous prime is 1640214139. The next prime is 1640214193. The reversal of 1640214187 is 7814120461.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1640214187 is a prime.

It is not a weakly prime, because it can be changed into another prime (1640214287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820107093 + 820107094.

It is an arithmetic number, because the mean of its divisors is an integer number (820107094).

Almost surely, 2^1640214187 is an apocalyptic number.

1640214187 is a deficient number, since it is larger than the sum of its proper divisors (1).

1640214187 is an equidigital number, since it uses as much as digits as its factorization.

1640214187 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10752, while the sum is 34.

The square root of 1640214187 is about 40499.5578617841. The cubic root of 1640214187 is about 1179.3250441938.

The spelling of 1640214187 in words is "one billion, six hundred forty million, two hundred fourteen thousand, one hundred eighty-seven".