40161780 has 72 divisors (see below), whose sum is σ = 122365152. Its totient is φ = 10662336.

The previous prime is 40161767. The next prime is 40161809. The reversal of 40161780 is 8716104.

It is a happy number.

40161780 is a `hidden beast` number, since 40 + 1 + 617 + 8 + 0 = 666.

40161780 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×40161780² = 3225937145536800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 62139 + ... + 62781.

It is an arithmetic number, because the mean of its divisors is an integer number (1699516).

Almost surely, 2^40161780 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40161780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (61182576).

40161780 is an abundant number, since it is smaller than the sum of its proper divisors (82203372).

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

40161780 is a wasteful number, since it uses less digits than its factorization.

40161780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1005 (or 1000 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 40161780 is about 6337.3322463005. The cubic root of 40161780 is about 342.4556356482.

Adding to 40161780 its reverse (8716104), we get a palindrome (48877884).

The spelling of 40161780 in words is "forty million, one hundred sixty-one thousand, seven hundred eighty".