40398379779 has 8 divisors (see below), whose sum is σ = 53866052800. Its totient is φ = 26931479976.

The previous prime is 40398379751. The next prime is 40398379843. The reversal of 40398379779 is 97797389304.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 40398379779 - 2²⁹ = 39861508867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40398379379) 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, 57829 + ... + 290070.

It is an arithmetic number, because the mean of its divisors is an integer number (6733256600).

Almost surely, 2^40398379779 is an apocalyptic number.

40398379779 is a deficient number, since it is larger than the sum of its proper divisors (13467673021).

40398379779 is a wasteful number, since it uses less digits than its factorization.

40398379779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 386609.

The product of its (nonzero) digits is 72013536, while the sum is 66.

The spelling of 40398379779 in words is "forty billion, three hundred ninety-eight million, three hundred seventy-nine thousand, seven hundred seventy-nine".