40144691 has 8 divisors (see below), whose sum is σ = 40998960. Its totient is φ = 39294112.

The previous prime is 40144679. The next prime is 40144703. The reversal of 40144691 is 19644104.

It is a happy number.

40144691 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (40144679) and next prime (40144703).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40144691 is a prime.

It is a super-2 number, since 2×40144691² = 3223192430970962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40144991) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 35645 + ... + 36753.

It is an arithmetic number, because the mean of its divisors is an integer number (5124870).

Almost surely, 2^40144691 is an apocalyptic number.

40144691 is a deficient number, since it is larger than the sum of its proper divisors (854269).

40144691 is a wasteful number, since it uses less digits than its factorization.

40144691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1845.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 40144691 is about 6335.9838225804. The cubic root of 40144691 is about 342.4070566708.

Adding to 40144691 its reverse (19644104), we get a palindrome (59788795).

The spelling of 40144691 in words is "forty million, one hundred forty-four thousand, six hundred ninety-one".