11945381 has 4 divisors (see below), whose sum is σ = 13651872. Its totient is φ = 10238892.

The previous prime is 11945377. The next prime is 11945399. The reversal of 11945381 is 18354911.

11945381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11945381 - 2² = 11945377 is a prime.

It is a super-2 number, since 2×11945381² = 285384254470322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11945321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 853235 + ... + 853248.

It is an arithmetic number, because the mean of its divisors is an integer number (3412968).

Almost surely, 2^11945381 is an apocalyptic number.

It is an amenable number.

11945381 is a deficient number, since it is larger than the sum of its proper divisors (1706491).

11945381 is an equidigital number, since it uses as much as digits as its factorization.

11945381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1706490.

The product of its digits is 4320, while the sum is 32.

The square root of 11945381 is about 3456.2090503903. The cubic root of 11945381 is about 228.5949693574.

The spelling of 11945381 in words is "eleven million, nine hundred forty-five thousand, three hundred eighty-one".