1489997388 has 54 divisors (see below), whose sum is σ = 3825229492. Its totient is φ = 451068640.

The previous prime is 1489997381. The next prime is 1489997413. The reversal of 1489997388 is 8837999841.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is not an unprimeable number, because it can be changed into a prime (1489997381) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1470370 + ... + 1471382.

Almost surely, 2^1489997388 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 1489997388, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1912614746).

1489997388 is an abundant number, since it is smaller than the sum of its proper divisors (2335232104).

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

1489997388 is a wasteful number, since it uses less digits than its factorization.

1489997388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2055 (or 1029 counting only the distinct ones).

The product of its digits is 31352832, while the sum is 66.

The square root of 1489997388 is about 38600.4842974800. The cubic root of 1489997388 is about 1142.1640917724.

The spelling of 1489997388 in words is "one billion, four hundred eighty-nine million, nine hundred ninety-seven thousand, three hundred eighty-eight".