40336821 has 12 divisors (see below), whose sum is σ = 66587872. Its totient is φ = 23049576.

The previous prime is 40336817. The next prime is 40336823. The reversal of 40336821 is 12863304.

It is a happy number.

It is not a de Polignac number, because 40336821 - 2² = 40336817 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40336823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 320071 + ... + 320196.

Almost surely, 2^40336821 is an apocalyptic number.

It is an amenable number.

40336821 is a deficient number, since it is larger than the sum of its proper divisors (26251051).

40336821 is a wasteful number, since it uses less digits than its factorization.

40336821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 640280 (or 640277 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 40336821 is about 6351.1275376897. The cubic root of 40336821 is about 342.9524338554.

The spelling of 40336821 in words is "forty million, three hundred thirty-six thousand, eight hundred twenty-one".