40512821 has 8 divisors (see below), whose sum is σ = 42379200. Its totient is φ = 38655232.

The previous prime is 40512803. The next prime is 40512827. The reversal of 40512821 is 12821504.

40512821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 40512821 - 2¹⁴ = 40496437 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40512827) 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 7 ways as a sum of consecutive naturals, for example, 8366 + ... + 12288.

It is an arithmetic number, because the mean of its divisors is an integer number (5297400).

Almost surely, 2^40512821 is an apocalyptic number.

It is an amenable number.

40512821 is a deficient number, since it is larger than the sum of its proper divisors (1866379).

40512821 is a wasteful number, since it uses less digits than its factorization.

40512821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4395.

The product of its (nonzero) digits is 640, while the sum is 23.

The square root of 40512821 is about 6364.9682638643. The cubic root of 40512821 is about 343.4505069213.

The spelling of 40512821 in words is "forty million, five hundred twelve thousand, eight hundred twenty-one".