166226940 has 144 divisors (see below), whose sum is σ = 565175520. Its totient is φ = 39191040.

The previous prime is 166226923. The next prime is 166226941. The reversal of 166226940 is 49622661.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 166226895 and 166226904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166226941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 72126 + ... + 74394.

It is an arithmetic number, because the mean of its divisors is an integer number (3924830).

Almost surely, 2^166226940 is an apocalyptic number.

166226940 is a gapful number since it is divisible by the number (10) 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 166226940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (282587760).

166226940 is an abundant number, since it is smaller than the sum of its proper divisors (398948580).

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

166226940 is a wasteful number, since it uses less digits than its factorization.

166226940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2332 (or 2327 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 166226940 is about 12892.9026987719. The cubic root of 166226940 is about 549.8368000638.

The spelling of 166226940 in words is "one hundred sixty-six million, two hundred twenty-six thousand, nine hundred forty".