3866809140 has 36 divisors (see below), whose sum is σ = 11729321604. Its totient is φ = 1031149056.

The previous prime is 3866809081. The next prime is 3866809147. The reversal of 3866809140 is 419086683.

It can be written as a sum of positive squares in 2 ways, for example, as 1267644816 + 2599164324 = 35604^2 + 50982^2 .

It is a tau number, because it is divible by the number of its divisors (36).

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 (3866809147) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10740957 + ... + 10741316.

It is an arithmetic number, because the mean of its divisors is an integer number (325814489).

Almost surely, 2^3866809140 is an apocalyptic number.

3866809140 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

3866809140 is an abundant number, since it is smaller than the sum of its proper divisors (7862512464).

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

3866809140 is a wasteful number, since it uses less digits than its factorization.

3866809140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21482288 (or 21482283 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The square root of 3866809140 is about 62183.6726158885. The cubic root of 3866809140 is about 1569.5828526480.

The spelling of 3866809140 in words is "three billion, eight hundred sixty-six million, eight hundred nine thousand, one hundred forty".