391734252 has 192 divisors, whose sum is σ = 1305077760. Its totient is φ = 98765568.

The previous prime is 391734251. The next prime is 391734263. The reversal of 391734252 is 252437193.

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

It is not an unprimeable number, because it can be changed into a prime (391734251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 225178 + ... + 226910.

It is an arithmetic number, because the mean of its divisors is an integer number (6797280).

Almost surely, 2^391734252 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 391734252, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (652538880).

391734252 is an abundant number, since it is smaller than the sum of its proper divisors (913343508).

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

391734252 is a wasteful number, since it uses less digits than its factorization.

391734252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1789 (or 1781 counting only the distinct ones).

The product of its digits is 45360, while the sum is 36.

The square root of 391734252 is about 19792.2775849572. The cubic root of 391734252 is about 731.6957214250.

The spelling of 391734252 in words is "three hundred ninety-one million, seven hundred thirty-four thousand, two hundred fifty-two".