3887447098921 has 9 divisors (see below), whose sum is σ = 3901792239261. Its totient is φ = 3873154528332.

The previous prime is 3887447098919. The next prime is 3887447098949. The reversal of 3887447098921 is 1298907447883.

The square root of 3887447098921 is 1971661.

It is a perfect power (a square), and thus also a powerful number.

3887447098921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 3887447098921 - 2¹ = 3887447098919 is a prime.

It is a super-2 number, since 2×3887447098921² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3887447098901) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 557976580 + ... + 557983546.

It is an arithmetic number, because the mean of its divisors is an integer number (433532471029).

Almost surely, 2^{3887447098921} is an apocalyptic number.

3887447098921 is the 1971661-st square number.

3887447098921 is the 985831-st centered octagonal number.

It is an amenable number.

3887447098921 is a deficient number, since it is larger than the sum of its proper divisors (14345140340).

3887447098921 is an frugal number, since it uses more digits than its factorization.

3887447098921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14500 (or 7250 counting only the distinct ones).

The product of its (nonzero) digits is 195084288, while the sum is 70.

The spelling of 3887447098921 in words is "three trillion, eight hundred eighty-seven billion, four hundred forty-seven million, ninety-eight thousand, nine hundred twenty-one".