397777 has 4 divisors (see below), whose sum is σ = 403300. Its totient is φ = 392256.

The previous prime is 397763. The next prime is 397799. The reversal of 397777 is 777793.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 777793 = 83 ⋅9371.

It can be written as a sum of positive squares in 2 ways, for example, as 123201 + 274576 = 351^2 + 524^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-397777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (397757) 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, 2652 + ... + 2797.

It is an arithmetic number, because the mean of its divisors is an integer number (100825).

2³⁹⁷⁷⁷⁷ is an apocalyptic number.

It is an amenable number.

397777 is a deficient number, since it is larger than the sum of its proper divisors (5523).

397777 is an equidigital number, since it uses as much as digits as its factorization.

397777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5522.

The product of its digits is 64827, while the sum is 40.

The square root of 397777 is about 630.6956476780. The cubic root of 397777 is about 73.5438829682.

It can be divided in two parts, 39 and 7777, that multiplied together give a palindrome (303303).

The spelling of 397777 in words is "three hundred ninety-seven thousand, seven hundred seventy-seven".