3866139904 has 72 divisors (see below), whose sum is σ = 8433462240. Its totient is φ = 1754265600.

The previous prime is 3866139883. The next prime is 3866139919. The reversal of 3866139904 is 4099316683.

It is a super-2 number, since 2×3866139904² = 29894075514602258432, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2649127 + ... + 2650585.

It is an arithmetic number, because the mean of its divisors is an integer number (117131420).

Almost surely, 2^3866139904 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 3866139904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4216731120).

3866139904 is an abundant number, since it is smaller than the sum of its proper divisors (4567322336).

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

3866139904 is a wasteful number, since it uses less digits than its factorization.

3866139904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2427 (or 2413 counting only the distinct ones).

The product of its (nonzero) digits is 839808, while the sum is 49.

The square root of 3866139904 is about 62178.2912598923. The cubic root of 3866139904 is about 1569.4922971955.

The spelling of 3866139904 in words is "three billion, eight hundred sixty-six million, one hundred thirty-nine thousand, nine hundred four".