40018690 has 16 divisors (see below), whose sum is σ = 72213120. Its totient is φ = 15967600.

The previous prime is 40018679. The next prime is 40018691. The reversal of 40018690 is 9681004.

It is a super-2 number, since 2×40018690² = 3202991098632200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (40018691) 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, 586 + ... + 8965.

It is an arithmetic number, because the mean of its divisors is an integer number (4513320).

Almost surely, 2^40018690 is an apocalyptic number.

40018690 is a deficient number, since it is larger than the sum of its proper divisors (32194430).

40018690 is a wasteful number, since it uses less digits than its factorization.

40018690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9977.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 40018690 is about 6326.0327220146. The cubic root of 40018690 is about 342.0484467921.

Adding to 40018690 its reverse (9681004), we get a palindrome (49699694).

The spelling of 40018690 in words is "forty million, eighteen thousand, six hundred ninety".