1964019905 has 4 divisors (see below), whose sum is σ = 2356823892. Its totient is φ = 1571215920.

The previous prime is 1964019901. The next prime is 1964019923. The reversal of 1964019905 is 5099104691.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 371371441 + 1592648464 = 19271^2 + 39908^2 .

It is not a de Polignac number, because 1964019905 - 2² = 1964019901 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1964019901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 196401986 + ... + 196401995.

It is an arithmetic number, because the mean of its divisors is an integer number (589205973).

Almost surely, 2^1964019905 is an apocalyptic number.

It is an amenable number.

1964019905 is a deficient number, since it is larger than the sum of its proper divisors (392803987).

1964019905 is an equidigital number, since it uses as much as digits as its factorization.

1964019905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 392803986.

The product of its (nonzero) digits is 87480, while the sum is 44.

The square root of 1964019905 is about 44317.2641867704. The cubic root of 1964019905 is about 1252.3199380463.

The spelling of 1964019905 in words is "one billion, nine hundred sixty-four million, nineteen thousand, nine hundred five".