9539449920 has 896 divisors, whose sum is σ = 45225492480. Its totient is φ = 1828085760.

The previous prime is 9539449903. The next prime is 9539449937. The reversal of 9539449920 is 299449359.

It is an interprime number because it is at equal distance from previous prime (9539449903) and next prime (9539449937).

It is a super-2 number, since 2×9539449920² (a number of 21 digits) contains 22 as substring.

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

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 8648089 + ... + 8649191.

It is an arithmetic number, because the mean of its divisors is an integer number (50474880).

Almost surely, 2^9539449920 is an apocalyptic number.

9539449920 is a gapful number since it is divisible by the number (90) 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 9539449920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22612746240).

9539449920 is an abundant number, since it is smaller than the sum of its proper divisors (35686042560).

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

9539449920 is a wasteful number, since it uses less digits than its factorization.

9539449920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1160 (or 1144 counting only the distinct ones).

The product of its (nonzero) digits is 3149280, while the sum is 54.

The square root of 9539449920 is about 97670.1076071896. The cubic root of 9539449920 is about 2120.8393733302.

The spelling of 9539449920 in words is "nine billion, five hundred thirty-nine million, four hundred forty-nine thousand, nine hundred twenty".