3890261221 has 16 divisors (see below), whose sum is σ = 4861438848. Its totient is φ = 3024345600.

The previous prime is 3890261201. The next prime is 3890261233. The reversal of 3890261221 is 1221620983.

It is a cyclic number.

It is not a de Polignac number, because 3890261221 - 2⁵ = 3890261189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3890261201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25000 + ... + 91681.

It is an arithmetic number, because the mean of its divisors is an integer number (303839928).

Almost surely, 2^3890261221 is an apocalyptic number.

It is an amenable number.

3890261221 is a deficient number, since it is larger than the sum of its proper divisors (971177627).

3890261221 is a wasteful number, since it uses less digits than its factorization.

3890261221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117132.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 3890261221 is about 62371.9586112221. The cubic root of 3890261221 is about 1572.7496167208.

The spelling of 3890261221 in words is "three billion, eight hundred ninety million, two hundred sixty-one thousand, two hundred twenty-one".