1720963409 has 4 divisors (see below), whose sum is σ = 1877414640. Its totient is φ = 1564512180.

The previous prime is 1720963369. The next prime is 1720963423. The reversal of 1720963409 is 9043690271.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1720963409 - 2¹² = 1720959313 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1720963429) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78225599 + ... + 78225620.

It is an arithmetic number, because the mean of its divisors is an integer number (469353660).

Almost surely, 2^1720963409 is an apocalyptic number.

It is an amenable number.

1720963409 is a deficient number, since it is larger than the sum of its proper divisors (156451231).

1720963409 is a wasteful number, since it uses less digits than its factorization.

1720963409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156451230.

The product of its (nonzero) digits is 81648, while the sum is 41.

The square root of 1720963409 is about 41484.4960075448. The cubic root of 1720963409 is about 1198.3689435409.

The spelling of 1720963409 in words is "one billion, seven hundred twenty million, nine hundred sixty-three thousand, four hundred nine".