391649496 has 128 divisors (see below), whose sum is σ = 1153198080. Its totient is φ = 108527616.

The previous prime is 391649491. The next prime is 391649501. The reversal of 391649496 is 694946193.

It is an interprime number because it is at equal distance from previous prime (391649491) and next prime (391649501).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391649491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1523800 + ... + 1524056.

It is an arithmetic number, because the mean of its divisors is an integer number (9009360).

Almost surely, 2^391649496 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 391649496, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (576599040).

391649496 is an abundant number, since it is smaller than the sum of its proper divisors (761548584).

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

391649496 is a wasteful number, since it uses less digits than its factorization.

391649496 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 513 (or 509 counting only the distinct ones).

The product of its digits is 1259712, while the sum is 51.

The square root of 391649496 is about 19790.1363310110. The cubic root of 391649496 is about 731.6429474885.

The spelling of 391649496 in words is "three hundred ninety-one million, six hundred forty-nine thousand, four hundred ninety-six".