1896443640 has 576 divisors, whose sum is σ = 7858693440. Its totient is φ = 388177920.

The previous prime is 1896443623. The next prime is 1896443641. The reversal of 1896443640 is 463446981.

1896443640 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1896443641) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 25978644 + ... + 25978716.

It is an arithmetic number, because the mean of its divisors is an integer number (13643565).

Almost surely, 2^1896443640 is an apocalyptic number.

1896443640 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 1896443640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3929346720).

1896443640 is an abundant number, since it is smaller than the sum of its proper divisors (5962249800).

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

1896443640 is a wasteful number, since it uses less digits than its factorization.

1896443640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184 (or 164 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 45.

The square root of 1896443640 is about 43548.1760812092. The cubic root of 1896443640 is about 1237.7890796957.

The spelling of 1896443640 in words is "one billion, eight hundred ninety-six million, four hundred forty-three thousand, six hundred forty".