3991254120 has 192 divisors, whose sum is σ = 14969560320. Its totient is φ = 903370752.

The previous prime is 3991254097. The next prime is 3991254131. The reversal of 3991254120 is 214521993.

3991254120 is a `hidden beast` number, since 3 + 9 + 91 + 2 + 541 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 251872 + ... + 267248.

It is an arithmetic number, because the mean of its divisors is an integer number (77966460).

Almost surely, 2^3991254120 is an apocalyptic number.

3991254120 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 3991254120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7484780160).

3991254120 is an abundant number, since it is smaller than the sum of its proper divisors (10978306200).

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

3991254120 is a wasteful number, since it uses less digits than its factorization.

3991254120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15504 (or 15497 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 3991254120 is about 63176.3731152715. The cubic root of 3991254120 is about 1586.2432728153.

The spelling of 3991254120 in words is "three billion, nine hundred ninety-one million, two hundred fifty-four thousand, one hundred twenty".