397705138 has 16 divisors (see below), whose sum is σ = 619948800. Its totient is φ = 191142000.

The previous prime is 397705129. The next prime is 397705153. The reversal of 397705138 is 831507793.

It is a junction number, because it is equal to n+sod(n) for n = 397705094 and 397705103.

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 in 7 ways as a sum of consecutive naturals, for example, 12288 + ... + 30763.

It is an arithmetic number, because the mean of its divisors is an integer number (38746800).

Almost surely, 2^397705138 is an apocalyptic number.

397705138 is a deficient number, since it is larger than the sum of its proper divisors (222243662).

397705138 is a wasteful number, since it uses less digits than its factorization.

397705138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43233.

The product of its (nonzero) digits is 158760, while the sum is 43.

The square root of 397705138 is about 19942.5459257338. The cubic root of 397705138 is about 735.3945391308.

The spelling of 397705138 in words is "three hundred ninety-seven million, seven hundred five thousand, one hundred thirty-eight".