1640234929 has 2 divisors, whose sum is σ = 1640234930. Its totient is φ = 1640234928.

The previous prime is 1640234899. The next prime is 1640234941. The reversal of 1640234929 is 9294320461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1051056400 + 589178529 = 32420^2 + 24273^2 .

It is a cyclic number.

It is not a de Polignac number, because 1640234929 - 2²¹ = 1638137777 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1640234891 and 1640234900.

It is not a weakly prime, because it can be changed into another prime (1640234989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820117464 + 820117465.

It is an arithmetic number, because the mean of its divisors is an integer number (820117465).

Almost surely, 2^1640234929 is an apocalyptic number.

It is an amenable number.

1640234929 is a deficient number, since it is larger than the sum of its proper divisors (1).

1640234929 is an equidigital number, since it uses as much as digits as its factorization.

1640234929 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 93312, while the sum is 40.

The square root of 1640234929 is about 40499.8139378442. The cubic root of 1640234929 is about 1179.3300153854.

The spelling of 1640234929 in words is "one billion, six hundred forty million, two hundred thirty-four thousand, nine hundred twenty-nine".