397916455 has 4 divisors (see below), whose sum is σ = 477499752. Its totient is φ = 318333160.

The previous prime is 397916423. The next prime is 397916459. The reversal of 397916455 is 554619793.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 397916455 - 2⁵ = 397916423 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 397916399 and 397916408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397916459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39791641 + ... + 39791650.

It is an arithmetic number, because the mean of its divisors is an integer number (119374938).

Almost surely, 2^397916455 is an apocalyptic number.

397916455 is a deficient number, since it is larger than the sum of its proper divisors (79583297).

397916455 is an equidigital number, since it uses as much as digits as its factorization.

397916455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79583296.

The product of its digits is 1020600, while the sum is 49.

The square root of 397916455 is about 19947.8433671412. The cubic root of 397916455 is about 735.5247644639.

The spelling of 397916455 in words is "three hundred ninety-seven million, nine hundred sixteen thousand, four hundred fifty-five".