11981394 has 12 divisors (see below), whose sum is σ = 25959726. Its totient is φ = 3993792.

The previous prime is 11981393. The next prime is 11981399. The reversal of 11981394 is 49318911.

11981394 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 7634169 + 4347225 = 2763^2 + 2085^2 .

It is a zygodrome in base 8.

It is not an unprimeable number, because it can be changed into a prime (11981393) 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, 332799 + ... + 332834.

Almost surely, 2^11981394 is an apocalyptic number.

11981394 is an abundant number, since it is smaller than the sum of its proper divisors (13978332).

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

11981394 is a wasteful number, since it uses less digits than its factorization.

11981394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 665641 (or 665638 counting only the distinct ones).

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

The square root of 11981394 is about 3461.4150285685. The cubic root of 11981394 is about 228.8244620079.

The spelling of 11981394 in words is "eleven million, nine hundred eighty-one thousand, three hundred ninety-four".