40024021 has 4 divisors (see below), whose sum is σ = 40139712. Its totient is φ = 39908332.

The previous prime is 40024009. The next prime is 40024057. The reversal of 40024021 is 12042004.

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 40024021 - 2⁵ = 40023989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40023992 and 40024010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40024081) 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, 57325 + ... + 58018.

It is an arithmetic number, because the mean of its divisors is an integer number (10034928).

Almost surely, 2^40024021 is an apocalyptic number.

It is an amenable number.

40024021 is a deficient number, since it is larger than the sum of its proper divisors (115691).

40024021 is a wasteful number, since it uses less digits than its factorization.

40024021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115690.

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 40024021 is about 6326.4540621109. The cubic root of 40024021 is about 342.0636345232.

Adding to 40024021 its reverse (12042004), we get a palindrome (52066025).

The spelling of 40024021 in words is "forty million, twenty-four thousand, twenty-one".