1291763340 has 72 divisors (see below), whose sum is σ = 4478117280. Its totient is φ = 295259904.

The previous prime is 1291763339. The next prime is 1291763371. The reversal of 1291763340 is 433671921.

1291763340 is a `hidden beast` number, since 1 + 2 + 9 + 17 + 633 + 4 + 0 = 666.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1291763295 and 1291763304.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 511345 + ... + 513864.

Almost surely, 2^1291763340 is an apocalyptic number.

1291763340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1291763340 is an abundant number, since it is smaller than the sum of its proper divisors (3186353940).

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

1291763340 is a wasteful number, since it uses less digits than its factorization.

1291763340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1025231 (or 1025226 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 36.

The square root of 1291763340 is about 35941.1093317944. The cubic root of 1291763340 is about 1089.0830152219.

The spelling of 1291763340 in words is "one billion, two hundred ninety-one million, seven hundred sixty-three thousand, three hundred forty".