40687388391 has 8 divisors (see below), whose sum is σ = 58422916720. Its totient is φ = 25038392832.

The previous prime is 40687388389. The next prime is 40687388419. The reversal of 40687388391 is 19388378604.

40687388391 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 not a de Polignac number, because 40687388391 - 2¹ = 40687388389 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 (40687388321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 521633146 + ... + 521633223.

It is an arithmetic number, because the mean of its divisors is an integer number (7302864590).

Almost surely, 2^40687388391 is an apocalyptic number.

40687388391 is a deficient number, since it is larger than the sum of its proper divisors (17735528329).

40687388391 is a wasteful number, since it uses less digits than its factorization.

40687388391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1043266385.

The product of its (nonzero) digits is 6967296, while the sum is 57.

The spelling of 40687388391 in words is "forty billion, six hundred eighty-seven million, three hundred eighty-eight thousand, three hundred ninety-one".