397779 has 8 divisors (see below), whose sum is σ = 538560. Its totient is φ = 261096.

The previous prime is 397763. The next prime is 397799. The reversal of 397779 is 977793.

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

It is not a de Polignac number, because 397779 - 2⁴ = 397763 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 397779.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397729) 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, 789 + ... + 1190.

It is an arithmetic number, because the mean of its divisors is an integer number (67320).

2³⁹⁷⁷⁷⁹ is an apocalyptic number.

397779 is a deficient number, since it is larger than the sum of its proper divisors (140781).

397779 is a wasteful number, since it uses less digits than its factorization.

397779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2049.

The product of its digits is 83349, while the sum is 42.

The square root of 397779 is about 630.6972332268. The cubic root of 397779 is about 73.5440062262.

It can be divided in two parts, 397 and 779, that added together give a triangular number (1176 = T₄₈).

The spelling of 397779 in words is "three hundred ninety-seven thousand, seven hundred seventy-nine".