1996421905 has 8 divisors (see below), whose sum is σ = 2409091200. Its totient is φ = 1588214256.

The previous prime is 1996421899. The next prime is 1996421909. The reversal of 1996421905 is 5091246991.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1996421905 - 2²⁹ = 1459550993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1996421909) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1114425 + ... + 1116214.

It is an arithmetic number, because the mean of its divisors is an integer number (301136400).

Almost surely, 2^1996421905 is an apocalyptic number.

It is an amenable number.

1996421905 is a deficient number, since it is larger than the sum of its proper divisors (412669295).

1996421905 is a wasteful number, since it uses less digits than its factorization.

1996421905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2230823.

The product of its (nonzero) digits is 174960, while the sum is 46.

The square root of 1996421905 is about 44681.3373233165. The cubic root of 1996421905 is about 1259.1692485122.

The spelling of 1996421905 in words is "one billion, nine hundred ninety-six million, four hundred twenty-one thousand, nine hundred five".