3875867821 has 8 divisors (see below), whose sum is σ = 4430518784. Its totient is φ = 3321455760.

The previous prime is 3875867797. The next prime is 3875867833. The reversal of 3875867821 is 1287685783.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 3875867821 - 2⁷ = 3875867693 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3875867861) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23490 + ... + 91123.

It is an arithmetic number, because the mean of its divisors is an integer number (553814848).

Almost surely, 2^3875867821 is an apocalyptic number.

It is an amenable number.

3875867821 is a deficient number, since it is larger than the sum of its proper divisors (554650963).

3875867821 is a wasteful number, since it uses less digits than its factorization.

3875867821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119451.

The product of its digits is 4515840, while the sum is 55.

The square root of 3875867821 is about 62256.4681057318. The cubic root of 3875867821 is about 1570.8075714694.

The spelling of 3875867821 in words is "three billion, eight hundred seventy-five million, eight hundred sixty-seven thousand, eight hundred twenty-one".