3865394280 has 128 divisors (see below), whose sum is σ = 12666170880. Its totient is φ = 935896320.

The previous prime is 3865394249. The next prime is 3865394293. The reversal of 3865394280 is 824935683.

3865394280 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1565607 + ... + 1568073.

It is an arithmetic number, because the mean of its divisors is an integer number (98954460).

Almost surely, 2^3865394280 is an apocalyptic number.

3865394280 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 3865394280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6333085440).

3865394280 is an abundant number, since it is smaller than the sum of its proper divisors (8800776600).

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

3865394280 is a wasteful number, since it uses less digits than its factorization.

3865394280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3679 (or 3675 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 48.

The square root of 3865394280 is about 62172.2951160724. The cubic root of 3865394280 is about 1569.3913932453.

The spelling of 3865394280 in words is "three billion, eight hundred sixty-five million, three hundred ninety-four thousand, two hundred eighty".