1923135840 has 288 divisors, whose sum is σ = 6886204416. Its totient is φ = 488125440.

The previous prime is 1923135821. The next prime is 1923135853. The reversal of 1923135840 is 485313291.

It is a tau number, because it is divible by the number of its divisors (288).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1923135795 and 1923135804.

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 47 ways as a sum of consecutive naturals, for example, 2990559 + ... + 2991201.

It is an arithmetic number, because the mean of its divisors is an integer number (23910432).

Almost surely, 2^1923135840 is an apocalyptic number.

1923135840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1923135840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3443102208).

1923135840 is an abundant number, since it is smaller than the sum of its proper divisors (4963068576).

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

1923135840 is a wasteful number, since it uses less digits than its factorization.

1923135840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 762 (or 751 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 1923135840 is about 43853.5727164846. The cubic root of 1923135840 is about 1243.5692860004.

The spelling of 1923135840 in words is "one billion, nine hundred twenty-three million, one hundred thirty-five thousand, eight hundred forty".