391032798 has 128 divisors (see below), whose sum is σ = 930327552. Its totient is φ = 108573696.

The previous prime is 391032797. The next prime is 391032833. The reversal of 391032798 is 897230193.

It is a super-2 number, since 2×391032798² = 305813298223417608, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391032797) 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, 2854186 + ... + 2854322.

It is an arithmetic number, because the mean of its divisors is an integer number (7268184).

Almost surely, 2^391032798 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 391032798, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (465163776).

391032798 is an abundant number, since it is smaller than the sum of its proper divisors (539294754).

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

391032798 is a wasteful number, since it uses less digits than its factorization.

391032798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258.

The product of its (nonzero) digits is 81648, while the sum is 42.

The square root of 391032798 is about 19774.5492489715. The cubic root of 391032798 is about 731.2587265815.

The spelling of 391032798 in words is "three hundred ninety-one million, thirty-two thousand, seven hundred ninety-eight".