39699780397 has 4 divisors (see below), whose sum is σ = 39827432736. Its totient is φ = 39572128060.

The previous prime is 39699780391. The next prime is 39699780469. The reversal of 39699780397 is 79308799693.

39699780397 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 a cyclic number.

It is not a de Polignac number, because 39699780397 - 2³ = 39699780389 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 (39699780391) 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, 63825703 + ... + 63826324.

It is an arithmetic number, because the mean of its divisors is an integer number (9956858184).

Almost surely, 2^39699780397 is an apocalyptic number.

It is an amenable number.

39699780397 is a deficient number, since it is larger than the sum of its proper divisors (127652339).

39699780397 is a wasteful number, since it uses less digits than its factorization.

39699780397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127652338.

The product of its (nonzero) digits is 138883248, while the sum is 70.

The spelling of 39699780397 in words is "thirty-nine billion, six hundred ninety-nine million, seven hundred eighty thousand, three hundred ninety-seven".