40647641 has 4 divisors (see below), whose sum is σ = 41204532. Its totient is φ = 40090752.

The previous prime is 40647617. The next prime is 40647667. The reversal of 40647641 is 14674604.

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 11703241 + 28944400 = 3421^2 + 5380^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40647641 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40647598 and 40647607.

It is not an unprimeable number, because it can be changed into a prime (40647671) 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, 278336 + ... + 278481.

It is an arithmetic number, because the mean of its divisors is an integer number (10301133).

Almost surely, 2^40647641 is an apocalyptic number.

It is an amenable number.

40647641 is a deficient number, since it is larger than the sum of its proper divisors (556891).

40647641 is an equidigital number, since it uses as much as digits as its factorization.

40647641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 556890.

The product of its (nonzero) digits is 16128, while the sum is 32.

The square root of 40647641 is about 6375.5502507627. The cubic root of 40647641 is about 343.8310673375.

The spelling of 40647641 in words is "forty million, six hundred forty-seven thousand, six hundred forty-one".