11921958 has 64 divisors (see below), whose sum is σ = 28684800. Its totient is φ = 3659040.

The previous prime is 11921957. The next prime is 11921977. The reversal of 11921958 is 85912911.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11921957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 35853 + ... + 36183.

It is an arithmetic number, because the mean of its divisors is an integer number (448200).

Almost surely, 2^11921958 is an apocalyptic number.

11921958 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 11921958, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14342400).

11921958 is an abundant number, since it is smaller than the sum of its proper divisors (16762842).

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

11921958 is a wasteful number, since it uses less digits than its factorization.

11921958 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 394 (or 388 counting only the distinct ones).

The product of its digits is 6480, while the sum is 36.

The square root of 11921958 is about 3452.8188484194. The cubic root of 11921958 is about 228.4454587507.

The spelling of 11921958 in words is "eleven million, nine hundred twenty-one thousand, nine hundred fifty-eight".