38994972697 has 4 divisors (see below), whose sum is σ = 40048890916. Its totient is φ = 37941054480.

The previous prime is 38994972689. The next prime is 38994972703. The reversal of 38994972697 is 79627949983.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79627949983 = 40819 ⋅1950757.

It can be written as a sum of positive squares in 2 ways, for example, as 34120000656 + 4874972041 = 184716^2 + 69821^2 .

It is a cyclic number.

It is not a de Polignac number, because 38994972697 - 2³ = 38994972689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38994972607) 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, 526959054 + ... + 526959127.

It is an arithmetic number, because the mean of its divisors is an integer number (10012222729).

Almost surely, 2^38994972697 is an apocalyptic number.

38994972697 is a gapful number since it is divisible by the number (37) formed by its first and last digit.

It is an amenable number.

38994972697 is a deficient number, since it is larger than the sum of its proper divisors (1053918219).

38994972697 is a wasteful number, since it uses less digits than its factorization.

38994972697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1053918218.

The product of its digits is 370355328, while the sum is 73.

The spelling of 38994972697 in words is "thirty-eight billion, nine hundred ninety-four million, nine hundred seventy-two thousand, six hundred ninety-seven".