40402541 has 4 divisors (see below), whose sum is σ = 41005632. Its totient is φ = 39799452.

The previous prime is 40402519. The next prime is 40402543. The reversal of 40402541 is 14520404.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40402541 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 (40402543) 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, 301445 + ... + 301578.

It is an arithmetic number, because the mean of its divisors is an integer number (10251408).

Almost surely, 2^40402541 is an apocalyptic number.

It is an amenable number.

40402541 is a deficient number, since it is larger than the sum of its proper divisors (603091).

40402541 is an equidigital number, since it uses as much as digits as its factorization.

40402541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 603090.

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 40402541 is about 6356.2993164262. The cubic root of 40402541 is about 343.1385880421.

Adding to 40402541 its reverse (14520404), we get a palindrome (54922945).

The spelling of 40402541 in words is "forty million, four hundred two thousand, five hundred forty-one".