40144513 has 4 divisors (see below), whose sum is σ = 40205908. Its totient is φ = 40083120.

The previous prime is 40144501. The next prime is 40144529. The reversal of 40144513 is 31544104.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 24088464 + 16056049 = 4908^2 + 4007^2 .

It is a cyclic number.

It is not a de Polignac number, because 40144513 - 2²⁵ = 6590081 is a prime.

It is a super-2 number, since 2×40144513² = 3223163848014338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40144543) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29706 + ... + 31027.

It is an arithmetic number, because the mean of its divisors is an integer number (10051477).

Almost surely, 2^40144513 is an apocalyptic number.

It is an amenable number.

40144513 is a deficient number, since it is larger than the sum of its proper divisors (61395).

40144513 is an equidigital number, since it uses as much as digits as its factorization.

40144513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61394.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 40144513 is about 6335.9697758118. The cubic root of 40144513 is about 342.4065505969.

Adding to 40144513 its reverse (31544104), we get a palindrome (71688617).

The spelling of 40144513 in words is "forty million, one hundred forty-four thousand, five hundred thirteen".