40021441 has 4 divisors (see below), whose sum is σ = 40152112. Its totient is φ = 39890772.

The previous prime is 40021427. The next prime is 40021459. The reversal of 40021441 is 14412004.

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 not a de Polignac number, because 40021441 - 2⁵ = 40021409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40021481) 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, 64875 + ... + 65488.

It is an arithmetic number, because the mean of its divisors is an integer number (10038028).

Almost surely, 2^40021441 is an apocalyptic number.

It is an amenable number.

40021441 is a deficient number, since it is larger than the sum of its proper divisors (130671).

40021441 is a wasteful number, since it uses less digits than its factorization.

40021441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130670.

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 40021441 is about 6326.2501531318. The cubic root of 40021441 is about 342.0562844109.

Adding to 40021441 its reverse (14412004), we get a palindrome (54433445).

The spelling of 40021441 in words is "forty million, twenty-one thousand, four hundred forty-one".