397388889 has 16 divisors (see below), whose sum is σ = 623355840. Its totient is φ = 249341760.

The previous prime is 397388879. The next prime is 397388983. The reversal of 397388889 is 988883793.

It is not a de Polignac number, because 397388889 - 2⁹ = 397388377 is a prime.

It is not an unprimeable number, because it can be changed into a prime (397388809) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 432427 + ... + 433344.

It is an arithmetic number, because the mean of its divisors is an integer number (38959740).

Almost surely, 2^397388889 is an apocalyptic number.

It is an amenable number.

397388889 is a deficient number, since it is larger than the sum of its proper divisors (225966951).

397388889 is a wasteful number, since it uses less digits than its factorization.

397388889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 865797 (or 865791 counting only the distinct ones).

The product of its digits is 20901888, while the sum is 63.

The square root of 397388889 is about 19934.6153461761. The cubic root of 397388889 is about 735.1995626374.

The spelling of 397388889 in words is "three hundred ninety-seven million, three hundred eighty-eight thousand, eight hundred eighty-nine".