11949578 has 4 divisors (see below), whose sum is σ = 17924370. Its totient is φ = 5974788.

The previous prime is 11949577. The next prime is 11949583. The reversal of 11949578 is 87594911.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87594911 = 2777 ⋅31543.

It can be written as a sum of positive squares in only one way, i.e., 8862529 + 3087049 = 2977^2 + 1757^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (11949577) by changing a digit.

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 as a sum of consecutive naturals, namely, 2987393 + ... + 2987396.

Almost surely, 2^11949578 is an apocalyptic number.

11949578 is a deficient number, since it is larger than the sum of its proper divisors (5974792).

11949578 is an equidigital number, since it uses as much as digits as its factorization.

11949578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5974791.

The product of its digits is 90720, while the sum is 44.

The square root of 11949578 is about 3456.8161652017. The cubic root of 11949578 is about 228.6217384421.

The spelling of 11949578 in words is "eleven million, nine hundred forty-nine thousand, five hundred seventy-eight".