391538016 has 384 divisors, whose sum is σ = 1349913600. Its totient is φ = 109486080.

The previous prime is 391538011. The next prime is 391538027. The reversal of 391538016 is 610835193.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391538011) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 6418626 + ... + 6418686.

It is an arithmetic number, because the mean of its divisors is an integer number (3515400).

Almost surely, 2^391538016 is an apocalyptic number.

391538016 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 391538016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (674956800).

391538016 is an abundant number, since it is smaller than the sum of its proper divisors (958375584).

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

391538016 is a wasteful number, since it uses less digits than its factorization.

391538016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139 (or 125 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 391538016 is about 19787.3195759304. The cubic root of 391538016 is about 731.5735220654.

The spelling of 391538016 in words is "three hundred ninety-one million, five hundred thirty-eight thousand, sixteen".