391710042 has 48 divisors (see below), whose sum is σ = 895752000. Its totient is φ = 123368832.

The previous prime is 391710031. The next prime is 391710049. The reversal of 391710042 is 240017193.

It is a junction number, because it is equal to n+sod(n) for n = 391709988 and 391710015.

It is not an unprimeable number, because it can be changed into a prime (391710049) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 148834 + ... + 151442.

It is an arithmetic number, because the mean of its divisors is an integer number (18661500).

Almost surely, 2^391710042 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 391710042, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (447876000).

391710042 is an abundant number, since it is smaller than the sum of its proper divisors (504041958).

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

391710042 is a wasteful number, since it uses less digits than its factorization.

391710042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3075 (or 3072 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 391710042 is about 19791.6659733333. The cubic root of 391710042 is about 731.6806476701.

The spelling of 391710042 in words is "three hundred ninety-one million, seven hundred ten thousand, forty-two".