3871427621 has 4 divisors (see below), whose sum is σ = 3885404172. Its totient is φ = 3857451072.

The previous prime is 3871427617. The next prime is 3871427641. The reversal of 3871427621 is 1267241783.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1345862596 + 2525565025 = 36686^2 + 50255^2 .

It is a cyclic number.

It is not a de Polignac number, because 3871427621 - 2² = 3871427617 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 (3871427641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6987860 + ... + 6988413.

It is an arithmetic number, because the mean of its divisors is an integer number (971351043).

Almost surely, 2^3871427621 is an apocalyptic number.

It is an amenable number.

3871427621 is a deficient number, since it is larger than the sum of its proper divisors (13976551).

3871427621 is a wasteful number, since it uses less digits than its factorization.

3871427621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13976550.

The product of its digits is 112896, while the sum is 41.

The square root of 3871427621 is about 62220.7973349747. The cubic root of 3871427621 is about 1570.2075024262.

The spelling of 3871427621 in words is "three billion, eight hundred seventy-one million, four hundred twenty-seven thousand, six hundred twenty-one".