3900123643 has 4 divisors (see below), whose sum is σ = 4200133168. Its totient is φ = 3600114120.

The previous prime is 3900123637. The next prime is 3900123679. The reversal of 3900123643 is 3463210093.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 3900123643 - 2⁵ = 3900123611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3900120643) 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, 150004743 + ... + 150004768.

It is an arithmetic number, because the mean of its divisors is an integer number (1050033292).

Almost surely, 2^3900123643 is an apocalyptic number.

3900123643 is a deficient number, since it is larger than the sum of its proper divisors (300009525).

3900123643 is a wasteful number, since it uses less digits than its factorization.

3900123643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300009524.

The product of its (nonzero) digits is 11664, while the sum is 31.

The square root of 3900123643 is about 62450.9699124041. The cubic root of 3900123643 is about 1574.0775507816.

The spelling of 3900123643 in words is "three billion, nine hundred million, one hundred twenty-three thousand, six hundred forty-three".