1491493766 has 16 divisors (see below), whose sum is σ = 2581672704. Its totient is φ = 633005064.

The previous prime is 1491493763. The next prime is 1491493781. The reversal of 1491493766 is 6673941941.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1491493763) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 515720 + ... + 518603.

It is an arithmetic number, because the mean of its divisors is an integer number (161354544).

Almost surely, 2^1491493766 is an apocalyptic number.

1491493766 is a deficient number, since it is larger than the sum of its proper divisors (1090178938).

1491493766 is a wasteful number, since it uses less digits than its factorization.

1491493766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1034435.

The product of its digits is 979776, while the sum is 50.

The square root of 1491493766 is about 38619.8623249747. The cubic root of 1491493766 is about 1142.5463155734.

The spelling of 1491493766 in words is "one billion, four hundred ninety-one million, four hundred ninety-three thousand, seven hundred sixty-six".