1491640227 has 48 divisors (see below), whose sum is σ = 2718713088. Its totient is φ = 765512640.

The previous prime is 1491640223. The next prime is 1491640243. The reversal of 1491640227 is 7220461941.

It is a happy number.

1491640227 is a `hidden beast` number, since 1 + 4 + 9 + 1 + 640 + 2 + 2 + 7 = 666.

It is not a de Polignac number, because 1491640227 - 2² = 1491640223 is a prime.

It is a super-2 number, since 2×1491640227² = 4449981133609223058, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1491640191 and 1491640200.

It is not an unprimeable number, because it can be changed into a prime (1491640223) 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 47 ways as a sum of consecutive naturals, for example, 44553 + ... + 70485.

It is an arithmetic number, because the mean of its divisors is an integer number (56639856).

Almost surely, 2^1491640227 is an apocalyptic number.

1491640227 is a deficient number, since it is larger than the sum of its proper divisors (1227072861).

1491640227 is a wasteful number, since it uses less digits than its factorization.

1491640227 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26040 (or 26037 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 1491640227 is about 38621.7584659218. The cubic root of 1491640227 is about 1142.5837127571.

The spelling of 1491640227 in words is "one billion, four hundred ninety-one million, six hundred forty thousand, two hundred twenty-seven".