166402040 has 96 divisors (see below), whose sum is σ = 441877680. Its totient is φ = 56222208.

The previous prime is 166402037. The next prime is 166402063. The reversal of 166402040 is 40204661.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 166401997 and 166402015.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 142499 + ... + 143661.

Almost surely, 2^166402040 is an apocalyptic number.

166402040 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 166402040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (220938840).

166402040 is an abundant number, since it is smaller than the sum of its proper divisors (275475640).

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

166402040 is a wasteful number, since it uses less digits than its factorization.

166402040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1261 (or 1250 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 166402040 is about 12899.6914691786. The cubic root of 166402040 is about 550.0297945292.

The spelling of 166402040 in words is "one hundred sixty-six million, four hundred two thousand, forty".