40423021 has 8 divisors (see below), whose sum is σ = 40807800. Its totient is φ = 40040448.

The previous prime is 40423001. The next prime is 40423057. The reversal of 40423021 is 12032404.

It can be written as a sum of positive squares in 4 ways, for example, as 27678121 + 12744900 = 5261^2 + 3570^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 40423021 - 2⁵ = 40422989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40422986 and 40423004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40423001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88225 + ... + 88681.

It is an arithmetic number, because the mean of its divisors is an integer number (5100975).

Almost surely, 2^40423021 is an apocalyptic number.

It is an amenable number.

40423021 is a deficient number, since it is larger than the sum of its proper divisors (384779).

40423021 is a wasteful number, since it uses less digits than its factorization.

40423021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1103.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 40423021 is about 6357.9101126078. The cubic root of 40423021 is about 343.1965570958.

Adding to 40423021 its reverse (12032404), we get a palindrome (52455425).

The spelling of 40423021 in words is "forty million, four hundred twenty-three thousand, twenty-one".