23171940 has 192 divisors, whose sum is σ = 81285120. Its totient is φ = 5431680.

The previous prime is 23171927. The next prime is 23171959. The reversal of 23171940 is 4917132.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

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 63 ways as a sum of consecutive naturals, for example, 279139 + ... + 279221.

It is an arithmetic number, because the mean of its divisors is an integer number (423360).

Almost surely, 2^23171940 is an apocalyptic number.

23171940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 23171940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40642560).

23171940 is an abundant number, since it is smaller than the sum of its proper divisors (58113180).

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

23171940 is a wasteful number, since it uses less digits than its factorization.

23171940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159 (or 151 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 23171940 is about 4813.7241300266. The cubic root of 23171940 is about 285.0935980666.

The spelling of 23171940 in words is "twenty-three million, one hundred seventy-one thousand, nine hundred forty".