3921790902 has 8 divisors (see below), whose sum is σ = 7843581816. Its totient is φ = 1307263632.

The previous prime is 3921790891. The next prime is 3921790909. The reversal of 3921790902 is 2090971293.

It is a happy number.

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

3921790902 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3921790909) 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, 326815903 + ... + 326815914.

It is an arithmetic number, because the mean of its divisors is an integer number (980447727).

Almost surely, 2^3921790902 is an apocalyptic number.

3921790902 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

3921790902 is a wasteful number, since it uses less digits than its factorization.

3921790902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 653631822.

The product of its (nonzero) digits is 61236, while the sum is 42.

The square root of 3921790902 is about 62624.2038033219. The cubic root of 3921790902 is about 1576.9871150610.

The spelling of 3921790902 in words is "three billion, nine hundred twenty-one million, seven hundred ninety thousand, nine hundred two".