489939840 has 320 divisors, whose sum is σ = 1886844960. Its totient is φ = 120434688.

The previous prime is 489939823. The next prime is 489939851. The reversal of 489939840 is 48939984.

It is a tau number, because it is divible by the number of its divisors (320).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 673557 + ... + 674283.

Almost surely, 2^489939840 is an apocalyptic number.

489939840 is a gapful number since it is divisible by the number (40) 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 489939840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (943422480).

489939840 is an abundant number, since it is smaller than the sum of its proper divisors (1396905120).

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

489939840 is a wasteful number, since it uses less digits than its factorization.

489939840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 771 (or 750 counting only the distinct ones).

The product of its (nonzero) digits is 2239488, while the sum is 54.

The square root of 489939840 is about 22134.5847035810. The cubic root of 489939840 is about 788.3412506698.

The spelling of 489939840 in words is "four hundred eighty-nine million, nine hundred thirty-nine thousand, eight hundred forty".