1912989765 has 8 divisors (see below), whose sum is σ = 3060783648. Its totient is φ = 1020261200.

The previous prime is 1912989721. The next prime is 1912989779. The reversal of 1912989765 is 5679892191.

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

It is not a de Polignac number, because 1912989765 - 2²⁰ = 1911941189 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63766311 + ... + 63766340.

It is an arithmetic number, because the mean of its divisors is an integer number (382597956).

Almost surely, 2^1912989765 is an apocalyptic number.

1912989765 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1912989765 is a deficient number, since it is larger than the sum of its proper divisors (1147793883).

1912989765 is a wasteful number, since it uses less digits than its factorization.

1912989765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127532659.

The product of its digits is 2449440, while the sum is 57.

The square root of 1912989765 is about 43737.7384531939. The cubic root of 1912989765 is about 1241.3784888829.

The spelling of 1912989765 in words is "one billion, nine hundred twelve million, nine hundred eighty-nine thousand, seven hundred sixty-five".