40521647 has 2 divisors, whose sum is σ = 40521648. Its totient is φ = 40521646.

The previous prime is 40521631. The next prime is 40521673. The reversal of 40521647 is 74612504.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40521647 - 2⁴ = 40521631 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40521947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20260823 + 20260824.

It is an arithmetic number, because the mean of its divisors is an integer number (20260824).

Almost surely, 2^40521647 is an apocalyptic number.

40521647 is a deficient number, since it is larger than the sum of its proper divisors (1).

40521647 is an equidigital number, since it uses as much as digits as its factorization.

40521647 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 40521647 is about 6365.6615524233. The cubic root of 40521647 is about 343.4754461380.

The spelling of 40521647 in words is "forty million, five hundred twenty-one thousand, six hundred forty-seven".