397354819 has 2 divisors, whose sum is σ = 397354820. Its totient is φ = 397354818.

The previous prime is 397354817. The next prime is 397354861. The reversal of 397354819 is 918453793.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 397354819 - 2¹ = 397354817 is a prime.

It is a super-2 number, since 2×397354819² = 315781704365045522, which contains 22 as substring.

Together with 397354817, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (397354817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198677409 + 198677410.

It is an arithmetic number, because the mean of its divisors is an integer number (198677410).

Almost surely, 2^397354819 is an apocalyptic number.

397354819 is a deficient number, since it is larger than the sum of its proper divisors (1).

397354819 is an equidigital number, since it uses as much as digits as its factorization.

397354819 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 816480, while the sum is 49.

The square root of 397354819 is about 19933.7607841571. The cubic root of 397354819 is about 735.1785513429.

It can be divided in two parts, 397 and 354819, that added together give a square (355216 = 596²).

The spelling of 397354819 in words is "three hundred ninety-seven million, three hundred fifty-four thousand, eight hundred nineteen".