40002541 has 4 divisors (see below), whose sum is σ = 40068412. Its totient is φ = 39936672.

The previous prime is 40002491. The next prime is 40002559. The reversal of 40002541 is 14520004.

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 1822500 + 38180041 = 1350^2 + 6179^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40002541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40002041) 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, 32016 + ... + 33241.

It is an arithmetic number, because the mean of its divisors is an integer number (10017103).

Almost surely, 2^40002541 is an apocalyptic number.

It is an amenable number.

40002541 is a deficient number, since it is larger than the sum of its proper divisors (65871).

40002541 is an equidigital number, since it uses as much as digits as its factorization.

40002541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65870.

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 40002541 is about 6324.7562008349. The cubic root of 40002541 is about 342.0024309301.

Adding to 40002541 its reverse (14520004), we get a palindrome (54522545).

The spelling of 40002541 in words is "forty million, two thousand, five hundred forty-one".