40697393821 has 4 divisors (see below), whose sum is σ = 46511307232. Its totient is φ = 34883480412.

The previous prime is 40697393777. The next prime is 40697393827. The reversal of 40697393821 is 12839379604.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 40697393821 - 2¹³ = 40697385629 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 (40697393827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2906956695 + ... + 2906956708.

It is an arithmetic number, because the mean of its divisors is an integer number (11627826808).

Almost surely, 2^40697393821 is an apocalyptic number.

It is an amenable number.

40697393821 is a deficient number, since it is larger than the sum of its proper divisors (5813913411).

40697393821 is an equidigital number, since it uses as much as digits as its factorization.

40697393821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5813913410.

The product of its (nonzero) digits is 1959552, while the sum is 52.

The spelling of 40697393821 in words is "forty billion, six hundred ninety-seven million, three hundred ninety-three thousand, eight hundred twenty-one".