1923120640 has 120 divisors (see below), whose sum is σ = 5364145512. Its totient is φ = 659312640.

The previous prime is 1923120637. The next prime is 1923120653. The reversal of 1923120640 is 460213291.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 1923120599 and 1923120608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 117775 + ... + 133105.

Almost surely, 2^1923120640 is an apocalyptic number.

1923120640 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 1923120640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2682072756).

1923120640 is an abundant number, since it is smaller than the sum of its proper divisors (3441024872).

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

1923120640 is an equidigital number, since it uses as much as digits as its factorization.

1923120640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15368 (or 15345 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 1923120640 is about 43853.3994121322. The cubic root of 1923120640 is about 1243.5660097016.

The spelling of 1923120640 in words is "one billion, nine hundred twenty-three million, one hundred twenty thousand, six hundred forty".