397819621 has 8 divisors (see below), whose sum is σ = 413791488. Its totient is φ = 382044000.

The previous prime is 397819619. The next prime is 397819627. The reversal of 397819621 is 126918793.

It is a happy number.

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

It is not a de Polignac number, because 397819621 - 2¹ = 397819619 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397819627) 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, 44920 + ... + 53041.

It is an arithmetic number, because the mean of its divisors is an integer number (51723936).

Almost surely, 2^397819621 is an apocalyptic number.

397819621 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

397819621 is a deficient number, since it is larger than the sum of its proper divisors (15971867).

397819621 is a wasteful number, since it uses less digits than its factorization.

397819621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98123.

The product of its digits is 163296, while the sum is 46.

The square root of 397819621 is about 19945.4160397822. The cubic root of 397819621 is about 735.4650956713.

The spelling of 397819621 in words is "three hundred ninety-seven million, eight hundred nineteen thousand, six hundred twenty-one".