40687388393 has 4 divisors (see below), whose sum is σ = 40687881300. Its totient is φ = 40686895488.

The previous prime is 40687388389. The next prime is 40687388419. The reversal of 40687388393 is 39388378604.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 4462640809 + 36224747584 = 66803^2 + 190328^2 .

It is a cyclic number.

It is not a de Polignac number, because 40687388393 - 2² = 40687388389 is a prime.

It is a super-2 number, since 2×40687388393² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (40687388383) 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 3 ways as a sum of consecutive naturals, for example, 89180 + ... + 298877.

It is an arithmetic number, because the mean of its divisors is an integer number (10171970325).

Almost surely, 2^40687388393 is an apocalyptic number.

It is an amenable number.

40687388393 is a deficient number, since it is larger than the sum of its proper divisors (492907).

40687388393 is a wasteful number, since it uses less digits than its factorization.

40687388393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 492906.

The product of its (nonzero) digits is 20901888, while the sum is 59.

The spelling of 40687388393 in words is "forty billion, six hundred eighty-seven million, three hundred eighty-eight thousand, three hundred ninety-three".