40654121 has 4 divisors (see below), whose sum is σ = 41320644. Its totient is φ = 39987600.

The previous prime is 40654109. The next prime is 40654153. The reversal of 40654121 is 12145604.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5382400 + 35271721 = 2320^2 + 5939^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40654121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40654171) 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, 333170 + ... + 333291.

It is an arithmetic number, because the mean of its divisors is an integer number (10330161).

Almost surely, 2^40654121 is an apocalyptic number.

It is an amenable number.

40654121 is a deficient number, since it is larger than the sum of its proper divisors (666523).

40654121 is an equidigital number, since it uses as much as digits as its factorization.

40654121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 666522.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 40654121 is about 6376.0584219406. The cubic root of 40654121 is about 343.8493374173.

Adding to 40654121 its reverse (12145604), we get a palindrome (52799725).

The spelling of 40654121 in words is "forty million, six hundred fifty-four thousand, one hundred twenty-one".