40652021 has 8 divisors (see below), whose sum is σ = 41640984. Its totient is φ = 39674880.

The previous prime is 40652009. The next prime is 40652023. The reversal of 40652021 is 12025604.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 6195121 + 34456900 = 2489^2 + 5870^2 .

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 40652021 - 2¹⁰ = 40650997 is a prime.

It is a super-2 number, since 2×40652021² = 3305173622768882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40651984 and 40652002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40652023) 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, 4211 + ... + 9951.

It is an arithmetic number, because the mean of its divisors is an integer number (5205123).

Almost surely, 2^40652021 is an apocalyptic number.

It is an amenable number.

40652021 is a deficient number, since it is larger than the sum of its proper divisors (988963).

40652021 is an equidigital number, since it uses as much as digits as its factorization.

40652021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5911.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 40652021 is about 6375.8937412727. The cubic root of 40652021 is about 343.8434167707.

Adding to 40652021 its reverse (12025604), we get a palindrome (52677625).

The spelling of 40652021 in words is "forty million, six hundred fifty-two thousand, twenty-one".