1640235983 has 2 divisors, whose sum is σ = 1640235984. Its totient is φ = 1640235982.

The previous prime is 1640235979. The next prime is 1640236067. The reversal of 1640235983 is 3895320461.

It is a weak prime.

It is an emirp because it is prime and its reverse (3895320461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1640235983 - 2² = 1640235979 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1640235983.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1640235383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820117991 + 820117992.

It is an arithmetic number, because the mean of its divisors is an integer number (820117992).

Almost surely, 2^1640235983 is an apocalyptic number.

1640235983 is a deficient number, since it is larger than the sum of its proper divisors (1).

1640235983 is an equidigital number, since it uses as much as digits as its factorization.

1640235983 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 155520, while the sum is 41.

The square root of 1640235983 is about 40499.8269502476. The cubic root of 1640235983 is about 1179.3302679942.

The spelling of 1640235983 in words is "one billion, six hundred forty million, two hundred thirty-five thousand, nine hundred eighty-three".