3897439421 has 8 divisors (see below), whose sum is σ = 3985148160. Its totient is φ = 3809930128.

The previous prime is 3897439417. The next prime is 3897439453. The reversal of 3897439421 is 1249347983.

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

It is a cyclic number.

It is not a de Polignac number, because 3897439421 - 2² = 3897439417 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 3897439421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3897439321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9986 + ... + 88851.

It is an arithmetic number, because the mean of its divisors is an integer number (498143520).

Almost surely, 2^3897439421 is an apocalyptic number.

It is an amenable number.

3897439421 is a deficient number, since it is larger than the sum of its proper divisors (87708739).

3897439421 is an equidigital number, since it uses as much as digits as its factorization.

3897439421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99723.

The product of its digits is 1306368, while the sum is 50.

The square root of 3897439421 is about 62429.4755784477. The cubic root of 3897439421 is about 1573.7163534060.

The spelling of 3897439421 in words is "three billion, eight hundred ninety-seven million, four hundred thirty-nine thousand, four hundred twenty-one".