3847985421 has 8 divisors (see below), whose sum is σ = 5863596864. Its totient is φ = 2198848800.

The previous prime is 3847985381. The next prime is 3847985429. The reversal of 3847985421 is 1245897483.

It is a happy number.

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

It is not a de Polignac number, because 3847985421 - 2⁶ = 3847985357 is a prime.

It is a super-3 number, since 3×3847985421³ (a number of 30 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3847985429) 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, 91618680 + ... + 91618721.

It is an arithmetic number, because the mean of its divisors is an integer number (732949608).

Almost surely, 2^3847985421 is an apocalyptic number.

It is an amenable number.

3847985421 is a deficient number, since it is larger than the sum of its proper divisors (2015611443).

3847985421 is a wasteful number, since it uses less digits than its factorization.

3847985421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183237411.

The product of its digits is 1935360, while the sum is 51.

The square root of 3847985421 is about 62032.1321655156. The cubic root of 3847985421 is about 1567.0317863706.

The spelling of 3847985421 in words is "three billion, eight hundred forty-seven million, nine hundred eighty-five thousand, four hundred twenty-one".