1291968 has 42 divisors (see below), whose sum is σ = 3704844. Its totient is φ = 430464.

The previous prime is 1291967. The next prime is 1291991. The reversal of 1291968 is 8691921.

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

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (1291963) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 546 + ... + 1697.

2^1291968 is an apocalyptic number.

1291968 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1291968 is an abundant number, since it is smaller than the sum of its proper divisors (2412876).

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

1291968 is a wasteful number, since it uses less digits than its factorization.

1291968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2261 (or 2248 counting only the distinct ones).

The product of its digits is 7776, while the sum is 36.

The square root of 1291968 is about 1136.6477026766. The cubic root of 1291968 is about 108.9140528326.

The spelling of 1291968 in words is "one million, two hundred ninety-one thousand, nine hundred sixty-eight".