1021899648 has 512 divisors, whose sum is σ = 3807129600. Its totient is φ = 234455040.

The previous prime is 1021899643. The next prime is 1021899653. The reversal of 1021899648 is 8469981201.

1021899648 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (1021899643) and next prime (1021899653).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a junction number, because it is equal to n+sod(n) for n = 1021899597 and 1021899606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021899643) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 9550411 + ... + 9550517.

It is an arithmetic number, because the mean of its divisors is an integer number (7435800).

Almost surely, 2^1021899648 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1021899648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1903564800).

1021899648 is an abundant number, since it is smaller than the sum of its proper divisors (2785229952).

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

1021899648 is a wasteful number, since it uses less digits than its factorization.

1021899648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178 (or 166 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 48.

The square root of 1021899648 is about 31967.1651542641. The cubic root of 1021899648 is about 1007.2472333941.

The spelling of 1021899648 in words is "one billion, twenty-one million, eight hundred ninety-nine thousand, six hundred forty-eight".