40641397 has 4 divisors (see below), whose sum is σ = 40961536. Its totient is φ = 40321260.

The previous prime is 40641379. The next prime is 40641401. The reversal of 40641397 is 79314604.

It is a happy number.

40641397 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 40641397 - 2⁷ = 40641269 is a prime.

It is a super-3 number, since 3×40641397³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40642397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 159879 + ... + 160132.

It is an arithmetic number, because the mean of its divisors is an integer number (10240384).

Almost surely, 2^40641397 is an apocalyptic number.

It is an amenable number.

40641397 is a deficient number, since it is larger than the sum of its proper divisors (320139).

40641397 is a wasteful number, since it uses less digits than its factorization.

40641397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320138.

The product of its (nonzero) digits is 18144, while the sum is 34.

The square root of 40641397 is about 6375.0605487321. The cubic root of 40641397 is about 343.8134608125.

The spelling of 40641397 in words is "forty million, six hundred forty-one thousand, three hundred ninety-seven".