40181830 has 16 divisors (see below), whose sum is σ = 77891184. Its totient is φ = 14836320.

The previous prime is 40181821. The next prime is 40181831. The reversal of 40181830 is 3818104.

It is a super-2 number, since 2×40181830² = 3229158924297800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 40181795 and 40181804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40181831) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 154416 + ... + 154675.

It is an arithmetic number, because the mean of its divisors is an integer number (4868199).

Almost surely, 2^40181830 is an apocalyptic number.

40181830 is a deficient number, since it is larger than the sum of its proper divisors (37709354).

40181830 is a wasteful number, since it uses less digits than its factorization.

40181830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309111.

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 40181830 is about 6338.9139448331. The cubic root of 40181830 is about 342.5126143080.

Adding to 40181830 its reverse (3818104), we get a palindrome (43999934).

The spelling of 40181830 in words is "forty million, one hundred eighty-one thousand, eight hundred thirty".