1988921298 has 64 divisors (see below), whose sum is σ = 4909105152. Its totient is φ = 523126080.

The previous prime is 1988921293. The next prime is 1988921317. The reversal of 1988921298 is 8921298891.

1988921298 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (1988921293) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 204363 + ... + 213873.

It is an arithmetic number, because the mean of its divisors is an integer number (76704768).

Almost surely, 2^1988921298 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1988921298, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2454552576).

1988921298 is an abundant number, since it is smaller than the sum of its proper divisors (2920183854).

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

1988921298 is a wasteful number, since it uses less digits than its factorization.

1988921298 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9919.

The product of its digits is 1492992, while the sum is 57.

The square root of 1988921298 is about 44597.3238883232. The cubic root of 1988921298 is about 1257.5903594360.

The spelling of 1988921298 in words is "one billion, nine hundred eighty-eight million, nine hundred twenty-one thousand, two hundred ninety-eight".