38420779797 has 6 divisors (see below), whose sum is σ = 55496681942. Its totient is φ = 25613853192.

The previous prime is 38420779781. The next prime is 38420779811. The reversal of 38420779797 is 79797702483.

38420779797 is a `hidden beast` number, since 38 + 420 + 7 + 7 + 97 + 97 = 666.

It can be written as a sum of positive squares in only one way, i.e., 20807774001 + 17613005796 = 144249^2 + 132714^2 .

It is not a de Polignac number, because 38420779797 - 2⁴ = 38420779781 is a prime.

It is a super-2 number, since 2×38420779797² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38420779777) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2134487758 + ... + 2134487775.

Almost surely, 2^38420779797 is an apocalyptic number.

It is an amenable number.

38420779797 is a deficient number, since it is larger than the sum of its proper divisors (17075902145).

38420779797 is a wasteful number, since it uses less digits than its factorization.

38420779797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4268975539 (or 4268975536 counting only the distinct ones).

The product of its (nonzero) digits is 37340352, while the sum is 63.

The spelling of 38420779797 in words is "thirty-eight billion, four hundred twenty million, seven hundred seventy-nine thousand, seven hundred ninety-seven".