397886890 has 16 divisors (see below), whose sum is σ = 747335808. Its totient is φ = 152234896.

The previous prime is 397886861. The next prime is 397886893. The reversal of 397886890 is 98688793.

It is not an unprimeable number, because it can be changed into a prime (397886893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 864742 + ... + 865201.

It is an arithmetic number, because the mean of its divisors is an integer number (46708488).

Almost surely, 2^397886890 is an apocalyptic number.

397886890 is a deficient number, since it is larger than the sum of its proper divisors (349448918).

397886890 is a wasteful number, since it uses less digits than its factorization.

397886890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1729973.

The product of its (nonzero) digits is 5225472, while the sum is 58.

The square root of 397886890 is about 19947.1022958223. The cubic root of 397886890 is about 735.5065476348.

The spelling of 397886890 in words is "three hundred ninety-seven million, eight hundred eighty-six thousand, eight hundred ninety".