40397639797 has 4 divisors (see below), whose sum is σ = 41257164096. Its totient is φ = 39538115500.

The previous prime is 40397639747. The next prime is 40397639831. The reversal of 40397639797 is 79793679304.

40397639797 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 40397639797 - 2¹⁹ = 40397115509 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 (40397639747) 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, 429762079 + ... + 429762172.

It is an arithmetic number, because the mean of its divisors is an integer number (10314291024).

Almost surely, 2^40397639797 is an apocalyptic number.

40397639797 is a gapful number since it is divisible by the number (47) formed by its first and last digit.

It is an amenable number.

40397639797 is a deficient number, since it is larger than the sum of its proper divisors (859524299).

40397639797 is an equidigital number, since it uses as much as digits as its factorization.

40397639797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 859524298.

The product of its (nonzero) digits is 54010152, while the sum is 64.

The spelling of 40397639797 in words is "forty billion, three hundred ninety-seven million, six hundred thirty-nine thousand, seven hundred ninety-seven".