397686415 has 8 divisors (see below), whose sum is σ = 545398560. Its totient is φ = 272699232.

The previous prime is 397686337. The next prime is 397686431. The reversal of 397686415 is 514686793.

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

It is a cyclic number.

It is not a de Polignac number, because 397686415 - 2¹³ = 397678223 is a prime.

It is a congruent number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 5681200 + ... + 5681269.

It is an arithmetic number, because the mean of its divisors is an integer number (68174820).

Almost surely, 2^397686415 is an apocalyptic number.

397686415 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

397686415 is a deficient number, since it is larger than the sum of its proper divisors (147712145).

397686415 is a wasteful number, since it uses less digits than its factorization.

397686415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11362481.

The product of its digits is 1088640, while the sum is 49.

The square root of 397686415 is about 19942.0764966941. The cubic root of 397686415 is about 735.3829987485.

The spelling of 397686415 in words is "three hundred ninety-seven million, six hundred eighty-six thousand, four hundred fifteen".