391430016 has 128 divisors (see below), whose sum is σ = 1177610400. Its totient is φ = 127954944.

The previous prime is 391429967. The next prime is 391430021. The reversal of 391430016 is 610034193.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 182100 + ... + 184236.

Almost surely, 2^391430016 is an apocalyptic number.

391430016 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 391430016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (588805200).

391430016 is an abundant number, since it is smaller than the sum of its proper divisors (786180384).

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

391430016 is a wasteful number, since it uses less digits than its factorization.

391430016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2213 (or 2195 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 391430016 is about 19784.5903672530. The cubic root of 391430016 is about 731.5062512830.

It can be divided in two parts, 3914 and 30016, that added together give a triangular number (33930 = T₂₆₀).

The spelling of 391430016 in words is "three hundred ninety-one million, four hundred thirty thousand, sixteen".