3945921420 has 48 divisors (see below), whose sum is σ = 12626949888. Its totient is φ = 901924800.

The previous prime is 3945921389. The next prime is 3945921439. The reversal of 3945921420 is 241295493.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4697106 + ... + 4697945.

It is an arithmetic number, because the mean of its divisors is an integer number (263061456).

Almost surely, 2^3945921420 is an apocalyptic number.

3945921420 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

3945921420 is an abundant number, since it is smaller than the sum of its proper divisors (8681028468).

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

3945921420 is a wasteful number, since it uses less digits than its factorization.

3945921420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9395070 (or 9395068 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 39.

The square root of 3945921420 is about 62816.5696293581. The cubic root of 3945921420 is about 1580.2148695654.

The spelling of 3945921420 in words is "three billion, nine hundred forty-five million, nine hundred twenty-one thousand, four hundred twenty".