11973138 has 16 divisors (see below), whose sum is σ = 24130656. Its totient is φ = 3960320.

The previous prime is 11973113. The next prime is 11973139. The reversal of 11973138 is 83137911.

It is a junction number, because it is equal to n+sod(n) for n = 11973099 and 11973108.

It is not an unprimeable number, because it can be changed into a prime (11973139) 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 7 ways as a sum of consecutive naturals, for example, 6831 + ... + 8402.

It is an arithmetic number, because the mean of its divisors is an integer number (1508166).

Almost surely, 2^11973138 is an apocalyptic number.

11973138 is an abundant number, since it is smaller than the sum of its proper divisors (12157518).

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

11973138 is a wasteful number, since it uses less digits than its factorization.

11973138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15369.

The product of its digits is 4536, while the sum is 33.

The square root of 11973138 is about 3460.2222471974. Note that the first 4 decimals coincide. The cubic root of 11973138 is about 228.7718913625.

Adding to 11973138 its sum of digits (33), we get a triangular number (11973171 = T₄₈₉₃).

The spelling of 11973138 in words is "eleven million, nine hundred seventy-three thousand, one hundred thirty-eight".