397802880 has 128 divisors (see below), whose sum is σ = 1408946400. Its totient is φ = 106076160.

The previous prime is 397802863. The next prime is 397802887. The reversal of 397802880 is 88208793.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397802887) 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, 5770 + ... + 28790.

Almost surely, 2^397802880 is an apocalyptic number.

397802880 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 397802880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (704473200).

397802880 is an abundant number, since it is smaller than the sum of its proper divisors (1011143520).

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

397802880 is a wasteful number, since it uses less digits than its factorization.

397802880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23049 (or 23031 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 45.

The square root of 397802880 is about 19944.9963650034. The cubic root of 397802880 is about 735.4547789404.

The spelling of 397802880 in words is "three hundred ninety-seven million, eight hundred two thousand, eight hundred eighty".