391249338 has 32 divisors (see below), whose sum is σ = 804328704. Its totient is φ = 126814272.

The previous prime is 391249337. The next prime is 391249363. The reversal of 391249338 is 833942193.

It is a self number, because there is not a number n which added to its sum of digits gives 391249338.

It is not an unprimeable number, because it can be changed into a prime (391249337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39856 + ... + 48692.

It is an arithmetic number, because the mean of its divisors is an integer number (25135272).

Almost surely, 2^391249338 is an apocalyptic number.

391249338 is an abundant number, since it is smaller than the sum of its proper divisors (413079366).

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

391249338 is a wasteful number, since it uses less digits than its factorization.

391249338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9046.

The product of its digits is 139968, while the sum is 42.

The square root of 391249338 is about 19780.0237108048. The cubic root of 391249338 is about 731.3936833298.

The spelling of 391249338 in words is "three hundred ninety-one million, two hundred forty-nine thousand, three hundred thirty-eight".