1291678408 has 8 divisors (see below), whose sum is σ = 2421897030. Its totient is φ = 645839200.

The previous prime is 1291678373. The next prime is 1291678417. The reversal of 1291678408 is 8048761921.

It can be written as a sum of positive squares in only one way, i.e., 684450244 + 607228164 = 26162^2 + 24642^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 80729893 + ... + 80729908.

Almost surely, 2^1291678408 is an apocalyptic number.

It is an amenable number.

1291678408 is a deficient number, since it is larger than the sum of its proper divisors (1130218622).

1291678408 is a wasteful number, since it uses less digits than its factorization.

1291678408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161459807 (or 161459803 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 46.

The square root of 1291678408 is about 35939.9277684305. The cubic root of 1291678408 is about 1089.0591460339.

The spelling of 1291678408 in words is "one billion, two hundred ninety-one million, six hundred seventy-eight thousand, four hundred eight".