11403381 has 32 divisors (see below), whose sum is σ = 17473536. Its totient is φ = 6552000.

The previous prime is 11403373. The next prime is 11403383. The reversal of 11403381 is 18330411.

11403381 is nontrivially palindromic in base 2.

It is not a de Polignac number, because 11403381 - 2³ = 11403373 is a prime.

It is a super-2 number, since 2×11403381² = 260074196462322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11403383) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 72555 + ... + 72711.

It is an arithmetic number, because the mean of its divisors is an integer number (546048).

Almost surely, 2^11403381 is an apocalyptic number.

11403381 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11403381 is a deficient number, since it is larger than the sum of its proper divisors (6070155).

11403381 is a wasteful number, since it uses less digits than its factorization.

11403381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 11403381 is about 3376.8892489983. The cubic root of 11403381 is about 225.0839587903.

Adding to 11403381 its reverse (18330411), we get a palindrome (29733792).

The spelling of 11403381 in words is "eleven million, four hundred three thousand, three hundred eighty-one".