391948572 has 48 divisors (see below), whose sum is σ = 948800160. Its totient is φ = 125782272.

The previous prime is 391948559. The next prime is 391948573. The reversal of 391948572 is 275849193.

It is a super-3 number, since 3×391948572³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391948573) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 136738 + ... + 139574.

It is an arithmetic number, because the mean of its divisors is an integer number (19766670).

Almost surely, 2^391948572 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 391948572, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (474400080).

391948572 is an abundant number, since it is smaller than the sum of its proper divisors (556851588).

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

391948572 is a wasteful number, since it uses less digits than its factorization.

391948572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3270 (or 3268 counting only the distinct ones).

The product of its digits is 544320, while the sum is 48.

The square root of 391948572 is about 19797.6910774969. The cubic root of 391948572 is about 731.8291353712.

The spelling of 391948572 in words is "three hundred ninety-one million, nine hundred forty-eight thousand, five hundred seventy-two".