397211880 has 64 divisors (see below), whose sum is σ = 1283304960. Its totient is φ = 97774848.

The previous prime is 397211879. The next prime is 397211887. The reversal of 397211880 is 88112793.

It is a super-2 number, since 2×397211880² = 315554555226268800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (397211887) 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 15 ways as a sum of consecutive naturals, for example, 125752 + ... + 128871.

It is an arithmetic number, because the mean of its divisors is an integer number (20051640).

Almost surely, 2^397211880 is an apocalyptic number.

397211880 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

397211880 is an abundant number, since it is smaller than the sum of its proper divisors (886093080).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

397211880 is a wasteful number, since it uses less digits than its factorization.

397211880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254650 (or 254646 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 39.

The square root of 397211880 is about 19930.1751121258. The cubic root of 397211880 is about 735.0903864039.

The spelling of 397211880 in words is "three hundred ninety-seven million, two hundred eleven thousand, eight hundred eighty".