397923867 has 36 divisors (see below), whose sum is σ = 649843320. Its totient is φ = 240474960.

The previous prime is 397923853. The next prime is 397923959. The reversal of 397923867 is 768329793.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It is not a de Polignac number, because 397923867 - 2¹⁰ = 397922843 is a prime.

Its product of digits (3429216) is a multiple of the sum of its prime factors (729).

It is not an unprimeable number, because it can be changed into a prime (397923817) 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 35 ways as a sum of consecutive naturals, for example, 1140009 + ... + 1140357.

Almost surely, 2^397923867 is an apocalyptic number.

397923867 is a deficient number, since it is larger than the sum of its proper divisors (251919453).

397923867 is an equidigital number, since it uses as much as digits as its factorization.

397923867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 729 (or 363 counting only the distinct ones).

The product of its digits is 3429216, while the sum is 54.

The square root of 397923867 is about 19948.0291507708. The cubic root of 397923867 is about 735.5293313151.

The spelling of 397923867 in words is "three hundred ninety-seven million, nine hundred twenty-three thousand, eight hundred sixty-seven".