3900257021 has 8 divisors (see below), whose sum is σ = 3912798720. Its totient is φ = 3887734608.

The previous prime is 3900257003. The next prime is 3900257051. The reversal of 3900257021 is 1207520093.

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 3900257021 - 2²² = 3896062717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3900257051) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 473480 + ... + 481646.

It is an arithmetic number, because the mean of its divisors is an integer number (489099840).

Almost surely, 2^3900257021 is an apocalyptic number.

It is an amenable number.

3900257021 is a deficient number, since it is larger than the sum of its proper divisors (12541699).

3900257021 is an equidigital number, since it uses as much as digits as its factorization.

3900257021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9643.

The product of its (nonzero) digits is 3780, while the sum is 29.

The square root of 3900257021 is about 62452.0377649921. The cubic root of 3900257021 is about 1574.0954942232.

The spelling of 3900257021 in words is "three billion, nine hundred million, two hundred fifty-seven thousand, twenty-one".