397686861739 has 4 divisors (see below), whose sum is σ = 397728896656. Its totient is φ = 397644826824.

The previous prime is 397686861703. The next prime is 397686861743. The reversal of 397686861739 is 937168686793.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 937168686793 = 239017 ⋅3920929.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-397686861739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (397686861749) 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, 21003264 + ... + 21022189.

It is an arithmetic number, because the mean of its divisors is an integer number (99432224164).

Almost surely, 2^397686861739 is an apocalyptic number.

397686861739 is a deficient number, since it is larger than the sum of its proper divisors (42034917).

397686861739 is an equidigital number, since it uses as much as digits as its factorization.

397686861739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42034916.

The product of its digits is 493807104, while the sum is 73.

The spelling of 397686861739 in words is "three hundred ninety-seven billion, six hundred eighty-six million, eight hundred sixty-one thousand, seven hundred thirty-nine".