40144665 has 16 divisors (see below), whose sum is σ = 70070976. Its totient is φ = 19464000.

The previous prime is 40144639. The next prime is 40144679. The reversal of 40144665 is 56644104.

It is not a de Polignac number, because 40144665 - 2⁷ = 40144537 is a prime.

It is a super-2 number, since 2×40144665² = 3223188255924450, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 121486 + ... + 121815.

It is an arithmetic number, because the mean of its divisors is an integer number (4379436).

Almost surely, 2^40144665 is an apocalyptic number.

It is an amenable number.

40144665 is a deficient number, since it is larger than the sum of its proper divisors (29926311).

40144665 is a wasteful number, since it uses less digits than its factorization.

40144665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243320.

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 40144665 is about 6335.9817708071. The cubic root of 40144665 is about 342.4069827500.

Adding to 40144665 its reverse (56644104), we get a palindrome (96788769).

The spelling of 40144665 in words is "forty million, one hundred forty-four thousand, six hundred sixty-five".