1923994240 has 64 divisors (see below), whose sum is σ = 5256639360. Its totient is φ = 659653632.

The previous prime is 1923994231. The next prime is 1923994243. The reversal of 1923994240 is 424993291.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (64).

It is not an unprimeable number, because it can be changed into a prime (1923994243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 210252 + ... + 219211.

It is an arithmetic number, because the mean of its divisors is an integer number (82134990).

Almost surely, 2^1923994240 is an apocalyptic number.

1923994240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1923994240 is an abundant number, since it is smaller than the sum of its proper divisors (3332645120).

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

1923994240 is an equidigital number, since it uses as much as digits as its factorization.

1923994240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429489 (or 429477 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 43.

The square root of 1923994240 is about 43863.3587405251. The cubic root of 1923994240 is about 1243.7542826549.

The spelling of 1923994240 in words is "one billion, nine hundred twenty-three million, nine hundred ninety-four thousand, two hundred forty".