3999041280 has 864 divisors, whose sum is σ = 16499298816. Its totient is φ = 919683072.

The previous prime is 3999041273. The next prime is 3999041287. The reversal of 3999041280 is 821409993.

It is an interprime number because it is at equal distance from previous prime (3999041273) and next prime (3999041287).

It is a tau number, because it is divible by the number of its divisors (864).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3999041287) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 93000939 + ... + 93000981.

Almost surely, 2^3999041280 is an apocalyptic number.

3999041280 is a gapful number since it is divisible by the number (30) 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 3999041280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8249649408).

3999041280 is an abundant number, since it is smaller than the sum of its proper divisors (12500257536).

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

3999041280 is a wasteful number, since it uses less digits than its factorization.

3999041280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115 (or 89 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The square root of 3999041280 is about 63237.9734020628. The cubic root of 3999041280 is about 1587.2742190732.

The spelling of 3999041280 in words is "three billion, nine hundred ninety-nine million, forty-one thousand, two hundred eighty".