11989438 has 4 divisors (see below), whose sum is σ = 17984160. Its totient is φ = 5994718.

The previous prime is 11989423. The next prime is 11989451. The reversal of 11989438 is 83498911.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83498911 = 71 ⋅1176041.

It is a junction number, because it is equal to n+sod(n) for n = 11989394 and 11989403.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2997358 + ... + 2997361.

It is an arithmetic number, because the mean of its divisors is an integer number (4496040).

Almost surely, 2^11989438 is an apocalyptic number.

11989438 is a deficient number, since it is larger than the sum of its proper divisors (5994722).

11989438 is an equidigital number, since it uses as much as digits as its factorization.

11989438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5994721.

The product of its digits is 62208, while the sum is 43.

The square root of 11989438 is about 3462.5767861522. The cubic root of 11989438 is about 228.8756595064.

The spelling of 11989438 in words is "eleven million, nine hundred eighty-nine thousand, four hundred thirty-eight".