11781398 has 8 divisors (see below), whose sum is σ = 18083208. Its totient is φ = 5753664.

The previous prime is 11781389. The next prime is 11781421. The reversal of 11781398 is 89318711.

11781398 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68411 + ... + 68582.

It is an arithmetic number, because the mean of its divisors is an integer number (2260401).

Almost surely, 2^11781398 is an apocalyptic number.

11781398 is a deficient number, since it is larger than the sum of its proper divisors (6301810).

11781398 is a wasteful number, since it uses less digits than its factorization.

11781398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137038.

The product of its digits is 12096, while the sum is 38.

The square root of 11781398 is about 3432.4041137372. The cubic root of 11781398 is about 227.5441157453.

The spelling of 11781398 in words is "eleven million, seven hundred eighty-one thousand, three hundred ninety-eight".