491139936 has 216 divisors, whose sum is σ = 1686189960. Its totient is φ = 140216832.

The previous prime is 491139841. The next prime is 491140019. The reversal of 491139936 is 639931194.

It is a tau number, because it is divible by the number of its divisors (216).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 491139891 and 491139900.

It is a congruent number.

It is an unprimeable number.

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 35 ways as a sum of consecutive naturals, for example, 380380 + ... + 381668.

It is an arithmetic number, because the mean of its divisors is an integer number (7806435).

Almost surely, 2^491139936 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 491139936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (843094980).

491139936 is an abundant number, since it is smaller than the sum of its proper divisors (1195050024).

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

491139936 is a wasteful number, since it uses less digits than its factorization.

491139936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1328 (or 1301 counting only the distinct ones).

The product of its digits is 157464, while the sum is 45.

The square root of 491139936 is about 22161.6771928480. The cubic root of 491139936 is about 788.9844002178.

It can be divided in two parts, 49113 and 9936, that added together give a 10-th power (59049 = 3¹⁰).

The spelling of 491139936 in words is "four hundred ninety-one million, one hundred thirty-nine thousand, nine hundred thirty-six".