3999227904 has 504 divisors, whose sum is σ = 14276408328. Its totient is φ = 1114767360.

The previous prime is 3999227851. The next prime is 3999227909. The reversal of 3999227904 is 4097229993.

It is a tau number, because it is divible by the number of its divisors (504).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3999227909) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 97542124 + ... + 97542164.

It is an arithmetic number, because the mean of its divisors is an integer number (28326207).

Almost surely, 2^3999227904 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 3999227904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7138204164).

3999227904 is an abundant number, since it is smaller than the sum of its proper divisors (10277180424).

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

3999227904 is an frugal number, since it uses more digits than its factorization.

3999227904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96 (or 53 counting only the distinct ones).

The product of its (nonzero) digits is 2204496, while the sum is 54.

The square root of 3999227904 is about 63239.4489539559. The cubic root of 3999227904 is about 1587.2989098957.

It can be divided in two parts, 39992 and 27904, that added together give a triangular number (67896 = T₃₆₈).

The spelling of 3999227904 in words is "three billion, nine hundred ninety-nine million, two hundred twenty-seven thousand, nine hundred four".