397858646590 has 16 divisors (see below), whose sum is σ = 739247034240. Its totient is φ = 154009798560.

The previous prime is 397858646561. The next prime is 397858646593. The reversal of 397858646590 is 95646858793.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397858646593) 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, 641707185 + ... + 641707804.

It is an arithmetic number, because the mean of its divisors is an integer number (46202939640).

Almost surely, 2^397858646590 is an apocalyptic number.

397858646590 is a deficient number, since it is larger than the sum of its proper divisors (341388387650).

397858646590 is a wasteful number, since it uses less digits than its factorization.

397858646590 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1283415027.

The product of its (nonzero) digits is 391910400, while the sum is 70.

The spelling of 397858646590 in words is "three hundred ninety-seven billion, eight hundred fifty-eight million, six hundred forty-six thousand, five hundred ninety".