40654021 has 8 divisors (see below), whose sum is σ = 43858584. Its totient is φ = 37539840.

The previous prime is 40654007. The next prime is 40654037. The reversal of 40654021 is 12045604.

It can be written as a sum of positive squares in 4 ways, for example, as 5013121 + 35640900 = 2239^2 + 5970^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40654021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40653983 and 40654001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40654321) 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, 21660 + ... + 23461.

It is an arithmetic number, because the mean of its divisors is an integer number (5482323).

Almost surely, 2^40654021 is an apocalyptic number.

It is an amenable number.

40654021 is a deficient number, since it is larger than the sum of its proper divisors (3204563).

40654021 is a wasteful number, since it uses less digits than its factorization.

40654021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45191.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 40654021 is about 6376.0505801005. The cubic root of 40654021 is about 343.8490554863.

Adding to 40654021 its reverse (12045604), we get a palindrome (52699625).

The spelling of 40654021 in words is "forty million, six hundred fifty-four thousand, twenty-one".