40413693821 has 4 divisors (see below), whose sum is σ = 41807269500. Its totient is φ = 39020118144.

The previous prime is 40413693787. The next prime is 40413693851. The reversal of 40413693821 is 12839631404.

40413693821 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.

It can be written as a sum of positive squares in 2 ways, for example, as 6736305625 + 33677388196 = 82075^2 + 183514^2 .

It is a cyclic number.

It is not a de Polignac number, because 40413693821 - 2⁶ = 40413693757 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40413693851) 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, 696787796 + ... + 696787853.

It is an arithmetic number, because the mean of its divisors is an integer number (10451817375).

Almost surely, 2^40413693821 is an apocalyptic number.

It is an amenable number.

40413693821 is a deficient number, since it is larger than the sum of its proper divisors (1393575679).

40413693821 is a wasteful number, since it uses less digits than its factorization.

40413693821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1393575678.

The product of its (nonzero) digits is 124416, while the sum is 41.

The spelling of 40413693821 in words is "forty billion, four hundred thirteen million, six hundred ninety-three thousand, eight hundred twenty-one".