1923665394 has 64 divisors (see below), whose sum is σ = 4473504000. Its totient is φ = 540131328.

The previous prime is 1923665363. The next prime is 1923665399. The reversal of 1923665394 is 4935663291.

It is not an unprimeable number, because it can be changed into a prime (1923665399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 605442 + ... + 608610.

It is an arithmetic number, because the mean of its divisors is an integer number (69898500).

Almost surely, 2^1923665394 is an apocalyptic number.

1923665394 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1923665394, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2236752000).

1923665394 is an abundant number, since it is smaller than the sum of its proper divisors (2549838606).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1923665394 is a wasteful number, since it uses less digits than its factorization.

1923665394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3427.

The product of its digits is 1049760, while the sum is 48.

The square root of 1923665394 is about 43859.6100529861. The cubic root of 1923665394 is about 1243.6834184571.

The spelling of 1923665394 in words is "one billion, nine hundred twenty-three million, six hundred sixty-five thousand, three hundred ninety-four".