397780349 has 8 divisors (see below), whose sum is σ = 401855520. Its totient is φ = 393713136.

The previous prime is 397780307. The next prime is 397780351. The reversal of 397780349 is 943087793.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-397780349 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 397780297 and 397780306.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397780049) 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 7 ways as a sum of consecutive naturals, for example, 176222 + ... + 178464.

It is an arithmetic number, because the mean of its divisors is an integer number (50231940).

Almost surely, 2^397780349 is an apocalyptic number.

It is an amenable number.

397780349 is a deficient number, since it is larger than the sum of its proper divisors (4075171).

397780349 is a wasteful number, since it uses less digits than its factorization.

397780349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3979.

The product of its (nonzero) digits is 1143072, while the sum is 50.

The square root of 397780349 is about 19944.4315286247. The cubic root of 397780349 is about 735.4408936342.

The spelling of 397780349 in words is "three hundred ninety-seven million, seven hundred eighty thousand, three hundred forty-nine".