397923698 has 4 divisors (see below), whose sum is σ = 596885550. Its totient is φ = 198961848.

The previous prime is 397923683. The next prime is 397923731. The reversal of 397923698 is 896329793.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 896329793 = 103 ⋅8702231.

It can be written as a sum of positive squares in only one way, i.e., 352050169 + 45873529 = 18763^2 + 6773^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 99480923 + ... + 99480926.

Almost surely, 2^397923698 is an apocalyptic number.

397923698 is a deficient number, since it is larger than the sum of its proper divisors (198961852).

397923698 is a wasteful number, since it uses less digits than its factorization.

397923698 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198961851.

The product of its digits is 4408992, while the sum is 56.

The square root of 397923698 is about 19948.0249147629. The cubic root of 397923698 is about 735.5292271876.

The spelling of 397923698 in words is "three hundred ninety-seven million, nine hundred twenty-three thousand, six hundred ninety-eight".