11997438 has 16 divisors (see below), whose sum is σ = 24333696. Its totient is φ = 3942680.

The previous prime is 11997437. The next prime is 11997443. The reversal of 11997438 is 83479911.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 11997438.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11997437) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13656 + ... + 14507.

It is an arithmetic number, because the mean of its divisors is an integer number (1520856).

Almost surely, 2^11997438 is an apocalyptic number.

11997438 is an abundant number, since it is smaller than the sum of its proper divisors (12336258).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11997438 is a wasteful number, since it uses less digits than its factorization.

11997438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28239.

The product of its digits is 54432, while the sum is 42.

The square root of 11997438 is about 3463.7318025505. The cubic root of 11997438 is about 228.9265542516.

The spelling of 11997438 in words is "eleven million, nine hundred ninety-seven thousand, four hundred thirty-eight".