1916464640 has 240 divisors, whose sum is σ = 5119828560. Its totient is φ = 685670400.

The previous prime is 1916464607. The next prime is 1916464643. The reversal of 1916464640 is 464646191.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1916464643) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 46743020 + ... + 46743060.

It is an arithmetic number, because the mean of its divisors is an integer number (21332619).

Almost surely, 2^1916464640 is an apocalyptic number.

1916464640 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 1916464640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2559914280).

1916464640 is an abundant number, since it is smaller than the sum of its proper divisors (3203363920).

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

1916464640 is an equidigital number, since it uses as much as digits as its factorization.

1916464640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145 (or 98 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 41.

The square root of 1916464640 is about 43777.4444206146. Note that the first 4 decimals coincide. The cubic root of 1916464640 is about 1242.1296735704.

The spelling of 1916464640 in words is "one billion, nine hundred sixteen million, four hundred sixty-four thousand, six hundred forty".