3891399990 has 64 divisors (see below), whose sum is σ = 9409188096. Its totient is φ = 1029981312.

The previous prime is 3891399989. The next prime is 3891400027. The reversal of 3891399990 is 999931983.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2605684 + ... + 2607176.

It is an arithmetic number, because the mean of its divisors is an integer number (147018564).

Almost surely, 2^3891399990 is an apocalyptic number.

3891399990 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

3891399990 is an abundant number, since it is smaller than the sum of its proper divisors (5517788106).

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

3891399990 is a wasteful number, since it uses less digits than its factorization.

3891399990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2093.

The product of its (nonzero) digits is 4251528, while the sum is 60.

The square root of 3891399990 is about 62381.0867972016. The cubic root of 3891399990 is about 1572.9030617535.

The spelling of 3891399990 in words is "three billion, eight hundred ninety-one million, three hundred ninety-nine thousand, nine hundred ninety".