11291978 has 8 divisors (see below), whose sum is σ = 17934372. Its totient is φ = 5313856.

The previous prime is 11291957. The next prime is 11291981. The reversal of 11291978 is 87919211.

It can be written as a sum of positive squares in 2 ways, for example, as 10647169 + 644809 = 3263^2 + 803^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 166025 + ... + 166092.

Almost surely, 2^11291978 is an apocalyptic number.

11291978 is a deficient number, since it is larger than the sum of its proper divisors (6642394).

11291978 is a wasteful number, since it uses less digits than its factorization.

11291978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332136.

The product of its digits is 9072, while the sum is 38.

The square root of 11291978 is about 3360.3538504152. The cubic root of 11291978 is about 224.3485883049.

The spelling of 11291978 in words is "eleven million, two hundred ninety-one thousand, nine hundred seventy-eight".