11993404 has 18 divisors (see below), whose sum is σ = 21735392. Its totient is φ = 5784600.

The previous prime is 11993383. The next prime is 11993407. The reversal of 11993404 is 40439911.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11993407) 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 in 5 ways as a sum of consecutive naturals, for example, 38409 + ... + 38719.

Almost surely, 2^11993404 is an apocalyptic number.

It is an amenable number.

11993404 is a deficient number, since it is larger than the sum of its proper divisors (9741988).

11993404 is an equidigital number, since it uses as much as digits as its factorization.

11993404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 657 (or 344 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 11993404 is about 3463.1494336803. The cubic root of 11993404 is about 228.9008934052.

Multiplying 11993404 by its sum of digits (31), we get a square (371795524 = 19282²).

11993404 divided by its sum of digits (31) gives a square (386884 = 622²).

The spelling of 11993404 in words is "eleven million, nine hundred ninety-three thousand, four hundred four".