491405540 has 12 divisors (see below), whose sum is σ = 1031951676. Its totient is φ = 196562208.

The previous prime is 491405533. The next prime is 491405543. The reversal of 491405540 is 45504194.

It can be written as a sum of positive squares in 2 ways, for example, as 171138724 + 320266816 = 13082^2 + 17896^2 .

It is a junction number, because it is equal to n+sod(n) for n = 491405497 and 491405506.

It is not an unprimeable number, because it can be changed into a prime (491405543) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12285119 + ... + 12285158.

It is an arithmetic number, because the mean of its divisors is an integer number (85995973).

Almost surely, 2^491405540 is an apocalyptic number.

It is an amenable number.

491405540 is an abundant number, since it is smaller than the sum of its proper divisors (540546136).

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

491405540 is a wasteful number, since it uses less digits than its factorization.

491405540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24570286 (or 24570284 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 32.

The square root of 491405540 is about 22167.6687994024. The cubic root of 491405540 is about 789.1265997778.

The spelling of 491405540 in words is "four hundred ninety-one million, four hundred five thousand, five hundred forty".