3897621380 has 12 divisors (see below), whose sum is σ = 8185004940. Its totient is φ = 1559048544.

The previous prime is 3897621353. The next prime is 3897621383. The reversal of 3897621380 is 831267983.

It can be written as a sum of positive squares in 2 ways, for example, as 2748275776 + 1149345604 = 52424^2 + 33902^2 .

It is not an unprimeable number, because it can be changed into a prime (3897621383) 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, 97440515 + ... + 97440554.

It is an arithmetic number, because the mean of its divisors is an integer number (682083745).

Almost surely, 2^3897621380 is an apocalyptic number.

It is an amenable number.

3897621380 is an abundant number, since it is smaller than the sum of its proper divisors (4287383560).

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

3897621380 is a wasteful number, since it uses less digits than its factorization.

3897621380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194881078 (or 194881076 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 47.

The square root of 3897621380 is about 62430.9328778611. The cubic root of 3897621380 is about 1573.7408436218.

The spelling of 3897621380 in words is "three billion, eight hundred ninety-seven million, six hundred twenty-one thousand, three hundred eighty".